Your thoughts on selling

You might consider taking the time to listen to them as you might find that you're missing out on some music that you've forgotten about, overlooked, or enjoy more with your current system.

I had several stacks of CDs that I was ready to get rid of and after listening to them I opted to keep several of them that I wasn't expecting to enjoy.

This may be unreasonable depending on how many "tons" of vinyl you have and how much time you can dedicate to listening.  My goal was one CD each time that I sat down for a listening session.  If I didn't enjoy it after the first couple of songs I moved on.

If you actually have vinyl worth buying, it should not be too hard to sell. What I did - I put a link to my discogs on Facebook Marketplace. Many people saw the ad, looked through my Discogs, and asked me to put packages together. This made it easier for me to price over time, and you can just have people come to you and meet you outside in your driveway to complete the transaction. Generally the most expensive ones will be sold easily because you are selling them at a reasonable price and they are high in demand. Then, with whatever you don't sell, just sell the rest as a batch to the local record store.

If you are looking for an easy sale just sell them to a record store. They will not give you what they are worth individually but the process will be complete when done.

I would not have the buyer decide what to pay. And unless you really don't mind the headache of selling and mailing them individually, or you need the slightly extra cash (you need to also factor in your time), I'd agree with @bubba12 and sell them to a local store, or else offer them as one big lot on Discogs/Audiogon, you'll get a lot of bids that way. And it's no refunds, no exchanges on the lot. 

One other suggestion, if you have a few records with sentimental value, keep them for 'old times sake'. I got rid of a few that I ended up buying back, but it's not the same. 

This reinforces my decision to not go the vinyl route in my audio journey.. I still vividly remember the incredible feeling listening to vinyl in my early teens.. I am with @bubba12 A record store will take it off your hands. I took three big boxes of CDs to a store sometime back and ended up walking out of there with eighty two dollars heavier.. Looking back I wish I hadn't done that. Now with a nice CD player on hand I wish I had kept them..