Geoff,
I just did a general search on Chicago tours and got that page. It isn't associated with the Mob Wear Convention that I know of. Just wanted to see what else was available and decided to do some research.
As far as the a purchase of tickets, yea, go ahead and buy a block.....check's in the mail!!

(will have to figure something out I guess, but who's gonna want to spring for the whole thing? that's the question). Yet, if we each buy our own, we take a chance that one or some of us won't get on the tour don't we??
TIS