Tipping large amounts and/or dropping money at Casinos are not donations. They are not tax deductible nor are they for a definitive good cause. Its just being nice or having fun.
Just because it's not tax deductible doesn't mean it's not a donation. What if I dropped a trash bag of $1000 at the Goodwill?? But I didnt want anyone to know and Goodwill doesn't report it ?? What would you consider that ??
What if I went into walmart and made it rain of $1 bills. What is that??