I AGREE, The bowl tie-ins are a joke. UK and most other SEC schools would bring far more fans I would think, and would love to go to a warm weather bowl. Don't understand this at all.
The Miami Beach Bowl was created by the American Athletic Conference, and the Bahamas Bowl was created by the MAC in order to provide their schools more opportunities to play in bowl games. That's the reason why you see AAC-CUSA and MWC-CUSA matchups in those two games.
The Miami game is played in Marlins Park (baseball stadium), which seats about 34K for football. The Bahamas Bowl is played in a stadium that usually seats 15K, but can seat up to 30K if necessary. Both of the games are 2 years old.
So as you can probably see, those games at this point don't really care about having a Power5 school in them, though at some point they might. And of course at some point the SEC might see how successful the Bahamas and Miami Beach games are and then decide to create a game in those locations themselves.
As far as the Hawaii game is concerned, the "anchor" for that bowl has always been the University of Hawaii. The stadium does hold 50,000 fans, but outside of UofH, the game never draws a big crowd from any of the participating schools. It's just too remote for a large number of visiting fans to attend on short notice. As a result, the payout for the game is very small, and the schools lose money attending it. A bowl game that loses money for the team (and conference) attending is not something that any of the P5 conferences (especially the SEC) care to participate in.