True, I'm just thinking that running the idea by for approval might be a good idea before doing anything, and I agree with the keeping things "clean and transparent" notion he's said, even if he's indifferent to it either way.
A record of successful trades would certainly help things as far as people being able to see that things would be working as hoped, but again, transparency. If some user fucks another over, there should be a record of it that people can see, be it simply so people can compare the amount of satisfactory/complete trades to potential people that have gotten screwed over, or to have a record of not to trust [X] guy in the future (though he could potentially have burner emails or just make a new one and continue to fuck people over).
I suppose another important thing would be to at least state that there is a potential of risk involved (though hopefully there could eventually be a public record that shows there being little of it; might need to potentially be some additional confirmation from people that traded games arrived in the condition stated, at least for the record), especially given the nature of anonymity and not having an account or reputation on the line like you might elsewhere (I really prefer anonymity to identity based things, but in terms of buying, selling, or trading, the latter does grant some accountability).
Additionally, as far as fair trades go, how exactly would one determine that? Would it be done off average prices (IE: [X] user can't just offer a hardish to find $20 game for [Y] user's $50 one, and would need to potentially offer more as well to make the trade more equivalent), or would it just be two anons coming to an agreement where both feel content with it (IE: both [X] and [Y] anons want each others games, but neither care much about the potential monetary value to be gained or lost)?
I'd think it's something that could work, but would likely require everything to be ironed out, and try to remove potential for loophole abuse. Think of the problems that could potentially arise in advance, and then try to find what a workable solution/measure would wind up being.
I think SV and BS might be a bit easy for people to confuse, since technically a Greatest Hits print is a second version, and with reprints, there's various forms: some that have the same cover/contents as the original print (IE: various Atlus games use the same cover art/manual/game as the original print, and might simply not come with any extras like soundtrack disc or outer box), and others that are as different as a Greatest Hits print is to the original, but aren't due to being best sellers (IE: various DS games that got a Touch Generations reprint with those ugly orange banners and bumped down and cropped cover art).