I can see how some of the crusty older guys can be intimidating, but IME not too many of the DB forum regulars play $20K or more basses. My main bass cost $6K, which is modest for a DB, and I never got shunned, even well before i was a forum admin or even a mod. In fact, just the opposite: some of the more experienced players took me under their wings. One of these is a bassist who has played and toured with a lot of players I came up listening to on records. Another lives in NY, plays a factory bass that's worth probably $8K, and has written published books on bass line construction. Another mentor on that side is John Goldsby, who I've taught together with at the Aebersold jazz workshops every summer for the past 15 years. He's published numerous books and articles on bass playing, is one of the best musicians I know, and one of the nicest and most generous people I know to boot. Jeremy Allen, one of our mods, is the jazz bass professor at IU, one of the nicest people you'd ever want to meet, and a great player on top of that. Brian Bromberg pops in from time to time as well, and he's also super nice. And Lynn Seaton's forum is moderated by Lynn himself, so you can always ask questions directly to a master there.
There have always been and always will be snarky people on internet forums. it's part of the nature of the beast. The moderators in the DB forum rely on post reports from regular members to help regulate the forum, as all of the mods are busy and don't have nearly enough time to read everything that goes on. Please feel free to report posts that seem to break the rules, and we'll look into them. In the meantime, don't let a few snarky people scare you away from the forums. I found it a bit intimidating as well at first; in the beginning, i felt some of the same things that you did about the "experts" posting there, until I hear many of them play; once I learned that all I had to do was to click on some links to find out whose walk matched their talk, I became excited to get a chance to share ideas some of these folks. I still do, in spite of the occasional snark from some members. YMMV, of course.