I would love every BC member to contribute am become the future of the forums existence... BUT, I also see it from the other side of the glass.
If I owned a drum kit, and I wanted to sell said drum kit, an stumbled across/was told about an online forum where loads of drummers hung out daily and seemed to have a thriving sales section, would I join to sell the kit - hell yes, after all, I want to sell it!
If I had the time to look around and like what I find then I may post and stay, otherwise id sell the kit and move on.
If you had a car to sell and heard about a forum where there were loads of buyers and you didn't have to pay any sellers fees etc would you sell it there... Most likely. Would you stay and talk about cars everyday? Unlikely.
All that said - I'm off to the feedback section to leave some I forgot about