Yea, if these sellers actually cared about allotment restrictions, they would invented some pre-registration account system that verified actual identification.

> the more intensive your verification, the lower your conversion rate ^ True, but selling through stock does not seem to be the issue for this segment of sellers.

To some degree the concert ticket sellers have already (finally) solved this, haven't they? I like your idea tho, that type of vetting costs money because it probably involves humans do some amount of work. I have never investigated what is available, but the fact that I would even have to investigate what is available tells me there isn't already some obvious choice out there.