I've never really seen the appeal of webcam sessions, so I have no clue what is required to submit a tip like that. I know that there are many people who do enjoy this kind of interaction and, no doubt, of those, there must be a few who have the kind of money that even this large amount means nothing to them.
But, being the skeptical type, I wonder if the whole thing could have been staged by MFC just for the attention it's getting or it's some kind of scam/hack, or, if it is legit, what is the likelihood that the transaction actually got processed and didn't get rescinded the next day.