Will Booster Spend IP or RP
Will My Booster Spend RP Or IP?
Absolutely NO. Boosters are not allowed to spend your IP or RP.
There are cases where your booster can ask you if he is allowed to spend your IP, while spending RP is only allowed if you desire that from him.
Remember you are the boss of your own lol boost.
Short Version: Booster are not allowed to spend your IP or RP, he can ask you about spending IP, but for RP only you can tell him to do that.