So, if your booster club is a 501c3, it is against the rules to give extra compensation for any work. Every person in the club receives the same benefit regardless of amount of work. Not always fair, but that that is the way it goes. If you are giving extra benefits outside of what everyone else receives, then you can lose your status.
Most are set up to benefit the gymnasts only...meaning that you cannot pay for anything outside of normal gymnastics expenses (tuition is not included in that).
If you are not 501c3, then there are different rules, and I do not know those.