therefore audiophiles taking pictures and grading their used hi-fi accordingly, also paypal always protect the buyer, honestly there is no risk at all. Been buying everything used/demo and rarely meet dishonest sellers, it happened few times, but with paypal payment anyone can return anything for full refund and it's guaranteed by paypal policy.
It's even better if i can meet the seller, check his stuff, but it rarely happens, i do everything online. It's amazing how low the price for almost unused equipment can be even on audiogon. I can't remember i bought anything from a person i knew before. New people every month or so.