The owner starts with an estimate of the meet fees/coaches/etc. all lumped together and based on both what the upcoming meet fees are expected to be and a little on what the coaches/etc. were the previous year (as an estimate only). Then the owner sends each family an itemized statement of what the fees are expected to be (before start of competition season) along with what each gymnast has acquired in their booster account. We then pay the difference of the two (again, before season starts).
At the end of the competition season, the owner sends out another itemized statement (very detailed, including exactly how much was spent and to where that money was spent [coaches fees/etc] along with any further money acqired in the gymnast booster account). She compares what was the estimated fees (paid in the fall) and what the actual fees ended up being and then settles up. Sometimes the estimate was high, in which case the extra money goes into the gymnasts booster account (or back to parent I think, but nobody ever chooses that option). If the estimated fees were lower than the actual cost, parent has the choice to pull money out of booster account or pay directly. When it's been over the estimated fees, it has never been more than $50 to $100 from what I understand (we haven't been there THAT long).
I really like that I am entitled to an itemized statement of exactly where my dollars are going, not just the assumption that the money is going to where the owners say that it's going. It keeps everything honest, no misunderstandings, miscommunications, etc. The last gym that we were at was a no questions asked when it came to where the money is going (ended up with a lot of distrust between all the parents and the management, not good for either side).
Hope that helps!