Size of gym (and more importantly, the number of butts that sit in it) seems to be an oft-recurring topic in this thread. I agree it is a good metric for the quality of any potential additions/subtractions.
Currently, the A10 has five schools in the top-100 for attendance: UD, VCU,
SLU,
Richmond and
Rhode Island.
Here's a list of non P5/BE/AAC also in the top-100 (excluding the west): Old Dominion, Ohio, Bradley, Marshall, MTSU, Siena, Illinois State.