It depends on the community. Ours is definitely paying for the flying skills. We have people that can't even get released for the AFPC mail robot offers...CAG to AUAB, for example. We've been told, point blank, that the only way to leave the FTU is to work a one-for-one trade with an ops unit. There is zero chance to get to a staff unless you get picked up for school.
It's great if you legitimately only care about flying, but we've seen that the promotion rates for our community, and for 12B in particular, are behind the USAF average and the average in AFGSC.