Agreed. No retired boxer's autograph is worth $225. That doesn't even sell on eBay since there's no demand for autographs of retired former-athletes.
Tipping is a moronic concept. Quite frankly it should be abolished and is just a dismal excuse for business to subsidize their labor costs to their consumer. This chick feels slighted because she felt entitled to some huge payday because she thought she had a customer lottery of sorts. I tip 20 percent but generally my bills are rarely over 30 dollars. If I had a 25k tab I would rather cut my middle finger off and leave it as a tip than give someone a percentage. They'll get a reasonable flat fee in the three figure range and that'll be that.