I have an idea that is similar to this but doesn't adjust wack and the bg system. It's a fairly similar concept, I can propose it here or in another thread if you would prefer, but being similar, I think if the two ideas were combined, then maybe it would be more ideal.

Might as well post it here. Hopefully we can get this issue resolved for everyone to win. So far there has been this idea, bgs cost whatever the highest rank you achieve is, and one flat cost. The later two aren't possible. So something other than this idea would give us multiple things to work with.