Has anyone finally decided to sell their Turntable and Vinyl collection?

Yep. The record collection went in 1991. Don't miss the snap, crackle, pop, and like the space savings. Still have the TT (NAD w/Shure V15 Type V) because I was too lazy to dig it out of storage to see if it was worth anything. Next move it'll go. I have no interest in vinyl. My whole collection fits on a flash drive now.

On a vinyl enthusiasts portal, the answer to the OP's question will be difficult to get a clear answer, buying vinyl and producing tapes with the vinyl, was my first experience of music that I had a control of, if you discount choosing a radio station.
The whole experience around buying the vinyl, as well as the well known ritual and haptics, are indelible and in my experience not matched by any other medium.
With the knowledge learnt through continued pursuit of attempting to achieve the best replay ( budget dependent), the understanding of the requirements to achieve such a set up, becomes a hobby in itself, without any music involved.
The engineering, tuning, timing,leveling, attenuation, isolation, maintenance,   requirements to be thought about, for a device and media that can be disturbed by the most miniscule effects of the environment the device is set up in, has a varied level of appeal to any individual use Vinyl as a replay medium.
Taking into account the nurturing of such devices and media, to reassure one, that they are as close to a day it was bought condition, also has a infectious hold on a certain type of individual, these outlined requirements, become much more than the norm required for a maintenance of any tool one will use.
Give me a Swiss Analogue Watch of certain brands, these are engineered, to a similar discipline of a TT set up, the watch has to do a Job, just like the TT has to. 
Even though ownership of both watch and TT, might equate to equal amounts of pride of ownership. The discipline one will develop to maintain the unfaltering performance of one of these items will far surpass that of the other.   
I find it hard to believe that any individual born into the era of a non CD Market, who took the Vinyl experience, beyond just dropping a stylus into a groove, would separate themselves from their replay equipment and media collection without and regret .
I introduced for the first time into my system, the option to replay CD in 2016.
It was 1990, that I first entered into the serious world of being HiFi enthusiast, having my first commission built HiFi device built by a EE in 1993.
I have had my latest commission built device, designed and built by the same EE, supplied to me in 2018.
Relationships are created in HiFi that extend beyond the Devices and Media, and these friendships today are valued even more, as the shared ideas,
follow up discussions and works produced, are the root of some of the methods being put into use in the home system replays.
knowing a performer for a long time, that allowed one to share a input into their creativity,  who eventually presented a Album that is being played on the home system, will be a type of comparison.  
I put my system out for its first ever public audition in 2019, at the Wam Show at Kegworth Hotel, Room 106,
 ( The Build it Yourself, or if that is not possible, Have Someone Build it for You Room ).
Fifty Exhibitors were attending, and on the day, Five Hundred Paying Public visited.
With my intention of extending the social side of my HiFi Journey, meeting other enthusiasts, allowing others the chance to experience my system, and just maybe meet a few that are being influenced by some of the choices I have made for my system, in the hope they find something they wish to investigate, that was not on their radar.
I think it is fair to say I achieved my goal in every department        
  

If I had a turntable deck rig, I’d get rid of it as fast as possible. Thankfully I have an analog audio system with a turntable. 

I went digital early on and was never in the camp that digital didn’t sound good or better than vinyl. Since the 90’s I thought my digital source sounded superb (various sources) and has given me tons of pleasure.

Once I ripped all my CDs (torture!) to a server and added Tidal, the convenience was incredible. But the instant access gave me music ADD. With a new track only a touch away at any moment, I’d think "wow this track sounds great, I wonder what the next one is like" and I found myself sampling, sampling, sampling rather than listening at length.

Getting back in to vinyl a few years ago has cured me of music ADD.I put on a record and almost always listen to at least the whole side, very often the whole album. And because this is so, and because you can sample almost any album on the web no matter how obscure, I tend to buy only those albums I can tell I’d like to play through. If I only like a single song or something I don’t buy it. So this means I tend to select for albums I’ll listen to.  In contrast when I was doing digital downloads, or even creating playlists on Tidal,  I'd end up with tons of music I never ended up listening to.

I still have my digital sever of course and still use it sometimes. But almost every time I go back to the digital server, using my ipad as remote, I find myself falling in to the same music ADD pattern, and it’s back to vinyl.
And I enjoy having the physical collection of albums.

On a practical note, my head reels with the thought of having to sell my LP collection! It’s pretty idiosyncratic, with tons of Library Music albums that are worth good money (and that I paid good money for) only to the niche of folks who are in to it. So it seems I’d be stuck between just dumping the library to some local store or whoever would pay for it - taking a massive beating on re-sale value. Or I would have to sell it selectively on something like discogs, essentially turning record selling in to a second job, which I am very much not in to.

I'll start off with my selling of 18,000 records, mostly 78s over the past several decades.  I have a rule that if I don't potentially want to listen to a record 3 times annually, out it goes.  I still have 25,000 LPs, 7,000 78s and 7,000 CDs.  I want to sell 2,000 mint, mostly unplayed classical 78s from the 1930s and 1940s for $1,000.  I can't ship and am not going to list all the records.  They were purchased from someone who purchased but never listened to them (hence-mint).  I will never sell my ethnic and obscure LPs (many of which will never or cannot/lost tapes be duplicated into another format.  I love the well remastered CDs, particularly of 78 rpm vocal recordings where the acquisition, storage and playback requirements are burdensome (acoustics especially due to non-standard speeds and equalization).