DIY? Don't be afraid to list your gear. Everyone benefits.
The next comment will likely get deleted but I once inquired about potentially purchasing Audiogon. All I would do differently is moderate the forum and make it virtually impossible for the spam posts and scam listings. You want to partner up? Post about counterfeit products? One warning and then banned. Join today and want to sell something? Escrow funds until both parties consent. Post about politics? One warning, then penalty box.