Oregon, OSU, WSU all less than 50K for football. For example, if San Jose expands to 50,000 plus, they could get Cal and Stanfurd to play there occasionally, and maybe other Pac-10 schools as well. The big attendance for those games will really boost average attendance. You can attract big-name teams to your place if you have a big arena. You'll get a big turnout for those games, and it will boost your average attendance.
Rice is a good example here.
Texas is willing to play the Owls at the Summit in Houston, but they won't play at 5,000-seat Autry Court on campus. Other name programs have probably told Rice the same thing. A few points in response . . . Considering how WAC teams have historically drawn for conference games, it would not be cost effective to have a 50K stadium or 10K arena requirement to accomodate one big name game a year and have it be half empty or worse for the rest of the season during conference play. Hard to believe someone like SJSU would fork out the dough to go to 50K, and fill it with 10K or so for non-marquee home games.