A whimsical attempt at elucidation and enlightenment:
1. At the beginning of the 21st century, some westerners have more disposable income than they might possibly know what to do with. What they lack is fulfillment.
2. Rather than beating their chests and gesturing with their spears or forming armed gangs, some of these well-documented and much-maligned AWMs (angry white males) in this refined society tend to get out their aggression and deal with their angst by ritually throwing money at them.
3. The result is that wherever you go on the internet, you'll find AWMs thrashing about with their acquisitive hobbies. Thus, the figurative antlers on the wall become a totemic symbol for something far greater and the "internet special interest group" supplies the virtual setting of the great council around the campfire.
4. In the guitar world, the acronym is "G.A.S.": Guitar Acquisition Syndrome. Many AWMs, especially middle-aged AWMs, are engaged in the ritual spiritual "thrash". After stalking the great bear, they tell their peers of their journeys and trials and show-off the scalps around the glow of the electronic flames.
On a wine tasting board, the highlight posts would be, "Found in Lyon on my last scouting trip: No fruity aftertaste!", but the prices could very well be just as high. On an ale board, it might be, "Particularly nutty lot, this!", and the cost would be more pedestrian. On a railroad train-chasing board it might be, "Seen in Roanoke, on the rails: The Norfolk & Western Class J steam locomotive!", posted after a ritual safari.*
It's all a pretty benign, though odd, form of distraction. Usually, anyone with decent manners and a not-too-tall-tale is welcome. Ladies are often welcomed as well. At least these folks aren't careening through the society on horseback, tilting at windmills. To quote sargeant Hulka from the movie "Stripes", "Lighten up, Francis." Pull up a camp stool, stare into the electronic flames, and join in.
* I understand from a Massai aquaintance that "Safari" is the Massai word for "Adventure".