I'm very mixed about this topic. I've bought and sold stuff on here. I've met some awesome people.
The last few people I've tried to deal with wasted my time I'd rather go to GB and deal with the fees. I'm talking an 18+ Positive feedback member on here, who dropped a bunch of names from this club and that club, my word is good blah blah blah.... who said something was wrong with my brand new rifle (there clearly wasn't), made me drive down to have someone check it, only to confirm my suspicion, that the prospective buyer was a "loose screw behind the wheel." Hey buyer, rifle was deemed all good.....And then I get ah, oh I'm not interested anymore, but thanks.
This experience on 2a and having previously dealt with BMW club members confirms my suspicions..... There are really solid ones. And there are some that are complete asshats. While there are less asshats than good ones..... it's the asshats that make you sour and not want to meet up with the rest, contribute in events, support, etc.