After 20 years just tired of the bullshit.

If someone says "I'll take it!"

I say "Great, please paypal me $100 nonrefundable deposit" and then I never hear from them again. Probably happens at least 50 percent of the time.

Repeat until someone actually send the dough, or if someone you REALLY know or trust says they are coming to get it.

No need to be "fair" if you got 10 emails saying they want it, sell it to the person you know/trust the best who you know will actually come get it. There's no rule you have to accept them in chronological order or whatever.