And according to most sports organizations, the minute you get paid for the act of playing a sport (actual payment for play, not expense reimbursement and such), you forfeit your right to be an amateur and become a professional, solely based on the fact you were paid.
We used to have the option when I raced motorcycles -- if you were in the top 3, you could opt to take a trophy instead of the money, if you wanted to retain your amateur status.

