Steam Dumpster Diving

I guess this idea comes up often? Well I was thinking of banning the original key submitter after several reports, and to make the site invite based or something like that so scammers can't keep creating new accounts.

And if a user is banned, all the keys from the dumb are removed. And any fake keys that were created by him, will be refunded for points for anyone who redeemed them.

Isn't this checkable with ASF, or such?
(I don't know, I don't have/use ASF, but I think I've read something like it. And I know it can check what the key is, so that would prevent fake labelling of the keys)

I didn't mention it, but I plan to add cooldown time of sort. If people could choose what game they want outright, it would basically just be a system for trading, and the good stuff would run out pretty quickly, and only the stuff people don't want will be left, which removes the incentive to take part. But with element of randomness, even games you aren't completely into, you start actually considering, just so you wouldn't get something worse by redumping it.