The Gator Bowl, as well as others, are looking to fill the stadium and garner good TV ratings. The SEC schools travel well, due in part, to the proximity of many of the bowls. With the BE and the ACC, some usually travel well, while other's do not as much. If the whole ACC (or BE) was like Clemson fans, for example, switching a host conference may not be a preference.
Bowls value diversity and inter-sectional play, but not at the expense of ticket sales. They also may go for a team, if given the option, that assures a sellout or near one, rather than one ranked a bit higher but doesn't sell at the ticket levels sought.
This locked in Conference A #3 vs. Conference B #4 stuff, can make for some odd matchups. Sometimes it's pay-dirt. Of course the old system often had even worse scenarios at times.
The BCS system has diminished the importance of some historic and traditional bowls; while in too many years, falling short on what it was set-up to do. If all bowls stood for rewards of excellence, it would be nice. But too many bowls and slots to fill exist.