You'd have to work really hard to vet, and then continue to re-vet, your sellers in order to keep the crap out. There's just too much potential for profit in ab

You'd have to work really hard to vet, and then continue to re-vet, your sellers in order to keep the crap out. There's just too much potential for profit in abusing the system, managing to sell your $1.50 sweatshop knit hats for $40. You'd want to start off with carefully-selected invites to specific sellers, and then maybe do a referral-based system to bring on additional sellers. Video calls and photo ID for verification. Reporting systems if buyers get mass-produced junk. Sounds like it would take quite a bit of human effort and care so I can't imagine it getting funded :)