Let me make sure this makes sense...
Alabama expanded BD because it wasn't large enough for the 100,00+ fans who wanted to attend games.
CONTRAST:
Birmingham refused to keep up LF and allowed it to become a dump that seated 15,000 to 20,000 less than BD.
THEN... Birmingham tore down the upper deck. It was not re-built.
It's been a while since I was in school, but I would hazard a guess that LF now seats less than half what BD does.
The Birmingham rationale is that the City of Tuscaloosa should loose millions of dollars so that Alabama could play in a dump that seats half what The University does.
Alabama would be penalized by not having recruits on their campus...
(Real Life Experience: My last trip to LF, I paid $5 to park in an alley behind a store.
When the game was over a group of 'Gang Boys' shot it out in that alley, while Alabama fans ducked for cover. Never again...)