[corin_]

IANAL, but my understanding of entrapment is that law enforcement has to persuade you to break a law that you wouldn't otherwise have broken - for example if you walk up to a cop and say "sell me some weed" that isn't entrapment, unless he initiated it and persuaded you to try to buy some weed - so if this site was a honeypot, it wouldn't be entrapment, as buyers and sellers are both going there without any persuasion, because they already want to do something illegal.

That said, I agree with other comments here as to why it's unlikely to be a honeypot.