As far as I'm aware, no. The only time a discount happens is if you purchase a subscription to a game as a BYOND member (or at least it used to be that way, that feature may not exist anymore.)
Incorrect, he made his own system entirely that is inported by a text file(that he use to manually update, now its automated) he has uploaded to an angelfire site. It's a pretty decent system and in no way involved CheckPassport() if i recall.