How do you know? Most top 12 corps have femails in their front ensemble. It would seem the ladies aren't auditioning at Bloo. Do you really think there aren't any women talented enough to be in their front ensemble? I can see no women in the battery since not many audition, and most of the other top 12 corps do not have any female battery performers.
Look at the top WGI percussion ensembles. They all have female members.