IMO, it comes down to the mindset of the buyer. It is not easy to buy tickets, even online. If I happened to be at the gym and there were pro BBers there selling them, I'd be quite inclined to whip out my check card and buy a few (be sure to have wireless EFT capability that day also!)
It's hard to see the show on tv or on the radio while driving to work, then remember the website, look up info, order tickets, pick up tickets, then go to the show. BUT if all they have to do is shake hands with Phil Heath, then hand LIFT their credit card or cash while Phil talks with them about his diet, you will sell a hell of a lot of tickets.
AIDA, the right audience, and ease of buying. The 240 forumla