Whether he is guilty or not is no longer relevant. He has been rendered a pariah in the court of public opinion.
Cosby is both wealthy and famous. Once such an allegation is made, any number of people who've had even casual contact with him might see an opportunity to cash in and get rich by making a claim for themselves, and gain a little fame for themselves, too. (Janice Dickinson?)
I can't be certain either way.