I'm 95% sure this is a scammer
maybe he is not , again even if interested I wouldn't bet on because I'd have 90% probability to lose my money !
what I understand is that he is not stupid and he is trying to do a clean thing
maybe he is aware someone can see his sales as scams , but he also understand many others don't and they will rely on his 100% feeback/history , so that he will move some nice money into his bank account then disappear without big troubles ..
my opinion , there's a remote possiblity this is not a scammer , but it is very remote (

my point of view ) and at least I would stay away and advice anyone to stay away from his sales .
I would push myself questionin and pressing a bit on this seller to understand his real intentions if I was really interested in his sales ..
If i could I would point any potentional bidder to this thread though
but unfortunately I don't think there's a way to do it