I think the 'super' shills are fairly obvious to spot. You will note that 428 of their 456 posts on Audiogon are on one thread dedicated to Brand X. Where Brand X is the best thing in the Universe, and music never existed before Brand X came along.
I can think of at least 3 members right off the bat, primarily cable related. Where the cables are so incredibly good that you don't even need electronics or speakers to enter 'heaven'.
Yeah, they are irritating, but after a while the regulars find them amusing. I'll read them, just like the funny papers. Sure a few newbies will be scammed along the way, that's part of the initiation process.
However, some shills can sometimes be disguised as overly-enthusiastic audiophiles. Again, time and experience is the only teacher. There are only a handful of members who I know from experience over the years, whose opinion I hold in high regard. Most of these gentleman I chat with offline as well.
Sure, a world were everyone were honest and could be trusted would indeed be a wonderful world. I think that could be said for any avenue though, politics, cars, boats, relationships, etc.
I believe that deceit is a common human trait though, and has been bred into the human DNA. You can find deceit going back in history to the Trojan horse, probably even earlier.
I believe any attempt to eliminate common human traits will be an unsuccessful exploit. Human instincts will always win.