The topic of this thread scares me a little (no offence intended to the poster).
Aerobatics Rating Cost
Don't ever think of an aerobatic rating as a simple endorsement that costs $2,000 or whatever it costs.
It is the first component of a lengthy skill building process, sometimes lasting a lifetime.
Getting yourself signed off for aero's is great, but it's something you need to continue to practice, develop and keep current at.