Why would someone choose to sell 100,000$ worth of bitcoins to a new member, with no reputation, for 20% under the Gox price, while they could sell on a exchange that has been around for longer for a much better price?
To avoid banks, taxes, feds of country, etc. Basically people wanting untraced cash for BTC, most likely for illegal whatever would take this offer. No offense to any, I don't care what business is done. Carry on.