Is advice from a constant upgrader to be avoided

I can count on half a hand the number of people whose advice I trust. So yes, I'd say almost everyone's advice is suspect. Humans are predisposed to too many cognitive biases to be dependable. And obviously, that's not just in audio. It's in everything.

Since I depend on measurements, personal research and knowledged gained, my systems tend to be outside the herd-think of forums, and it has worked out well. My components tend to stick around with no complaints or regrets.

Oldhvymec

Digital has evolved significantly in the past 30 years (heck, I was using a 16 bit Sony CDP 30 years ago).  Analog, not so much-except the price tag of the discs and the gear

And again, what a judgemental, self-righteous bunch.  So you're asking if you should take advice from people who constantly upgrade.  The most obvious answer is, "YES!"  They've listened to a lot of different things, in a lot of different combinations.  A better question for you would be to ask if you should take "input" rather than "advice".  The answer is still, "yes", for the same reason.  Any modern audiophile level system, even at the very bottom of the class, is going to sound really nice compared to the cheap Best Buy system most people put in their home.  And, btw, that's great for them if that's all they want.  We've all been there, all started there, well most of us anyway.  Point is, there are a lot of people in here who've blown themselves away by how great there little system sounds, conclude that because they so enjoy listening to it that nothing could sound better and anyone who wants anything different is a fool.  I don't eat the same meal for dinner every night, I don't wear the same shoes everday, I don't go see the same performances time after time and I don't listen to the same CD forever and ever.  People who've had a lot of different components in their home have explored the nuances of sound variation that come from changing any and every single piece.  (hey, let's have some fun watching a select and particularly self-righteous segment of this group melt down of what impact changing cables has!!).  You can learn a lot about a landscape by talking with people who've walked down many paths.  There is one caveat, however, and that is that there are people (many/few?) who claim to have owned components that they've only ever seen online or in one of those old things called "magazines".  Their input is not completely useless because they are regurgitating the lessons learned by professional reviewers with far more knowledge/experience than the group here.  Just remember that another word for regurgitation is vomit, tho.

@surfcat

Ditto!!

If you have problems with the gear flippers, you can always go to the ignorant for advice. As we all know, lack of experience is a huge advantage.   ;) 

Don't think for a moment that holding a system for decades is advantageous, except fiscally. In terms of sound quality, it's gentrification. You assure the sound quality is slipping further from SOTA the longer you hold on to your system. If the goal is to not spend money, you have done well. If the goal is to advance your rig and listening experience, you have not done well. 

Now, watch, we'll have a diatribe or two from our "thrifty" members who will blab incessantly about how money is fairly disassociated with performance, etc. 

I am a System Builder, who loves working with different gear to hear the result, and there is absolutely nothing wrong with that. It is no worse than the person who does DIY equipment and pretends they have vetted it against manufactured products and claims their homemade stuff is superior. It's no worse than the Mediaphile who has a so-so rig, but spends inordinate amounts of money on media. 

There are all sorts of perspectives and approaches to this hobby. You don't like the gear flippers? Fine, find someone who anchors to their gear and take their advice. It's not life or death. 

mid-fi-crisis, you summarized, "

Is the constant flipper/upgrader always going to say that the gear they used to own was no good and they've now got better? Maybe their constant searching is because their ear is no good or they're addicted to the rush of opening a new box. "

You are overlooking another possiblity, one you may not like. The performance spectrum is much larger than you seem to realize. Show me a gear flipper who is habitually moving backwards in sound quality? You won't find many. They are advancing their systems, and why? Because the spectrum of performance is enormous and it goes quite a ways upward into SOTA. Nothing wrong with their ears at all. They just realize that there is a lot more out there to obtain than the average person realizes and they are committed to it. Most audiophiles want to pretend they are really pushing to get SOTA. No, they are not. They give lip service to it. They don't put in the money, time or energy into it. 

Being a reviewer has allowed me to explore parts of the performance spectrum I never would have visited otherwise. I change gear to go deeper into the performance spectrum. So, is there any inherent advantage to listen to someone with less expereince? No, as ignorance is not terribly helpful in this regard. YMMV

Again, we will have all sorts of inexperineced types or chintzy audiophiles arguing that this is all wrong. I do not care about their opinions and have no interest in debating my discussion. 

When I wish to learn, I pay less attention to what others say. I build systems, and imo so do those who are actually working to obtain superior sound. 

So, pick; get your advice from someone who is largely ignorant of the performance spectrum, or someone with much more expereince. You pick your authority, you get your results.  :)