I think it's worth mentioning that the Steelers/Dolphins game is the NFL season opener, not just a Steelers game-it's the only game that day, it's in primetime, I think there's even extra entertainment either on the field or in the parking lot.
Being the cynic that I am, and to refute DJE's assertion that all of the teams fit into his mold... Green Bay, has net exactly had a a large amount of success in recent years. It IS interesting to note that they were 22d last year in tickets sold online, and jumped to 3rd this year, on the tails of a lousy season, a lousy pre-season, and no word that this will in fact be Favre's last year. In their case, knowing how hard it is to get tickets at ANY price when they are doing well, I would say that the jump in online value is due to a jump in online supply, which would indicate that they are actually a poorer draw for those that have had season tickets forever. The season ticket holders are dumping them, and those that have never had any opportunity to attend a game at Lambeau are paying whatever it takes to get the elusive ducat, perhaps the one true example of traditoin and fan loyalty.