Your #2 and 3 are excellent questions. Your #1 may be true but irrelevant to the girl. He donated $10,000 more than you and I combined, I would presume.
Actually I’m not impressed with the amount. I’m glad she got the money, but I remain unimpressed with Charlie’s motivation. Johnny Carson did this sort of thing all the time and kept it to himself. His friends didn’t say a word until after he passed away, as he preferred to act anonymously.
Charlie has already gotten what he paid for, he doesn’t need my adoration.