BU and college hockey in general in Boston is a bit of a special case. While BU is huge, 30K plus, the student population is so diverse and a very large percentage of them are not interested in sports in any way shape or form, far more than you'd find at your average State U, I'd venture over 75% couldn't tell you the name of BU's starting goalie. Additionally, while BU draws roughly 5-6K a game, it can't be overlooked that there are three other programs within a two mile radius of BU's arena, BC, who draws 6-7K, NU who gets 2-3, and Harvard who gets the same. Not to mention the multitude of programs within a 25 mile drive of Boston. While that's certainly not an argument that UConn should be able to outdraw BU or BC, it speaks to the nature of college hockey being a niche sport that is wildly successful in some spots, but not others.
And before anyone asks, no, UConn or anyone else is not getting into the Beanpot, ever.