Professional or Not?

I found this message board about a month ago and have a question. I apologize if these same questions were posed in previous threads (I'm sure they are but I am too lazy to sift thru 100,000 messages).

1) What constitutes a blackjack professional? I know this is mainly a subjective question but would be curious as to the responses. My answer to this question would be anyone who plays 300+ hours/year and whose minimum bet level is $25. Of course, I think it could be assumed that all BJ Pros are 99% accurate in their system.

Thanks to all that respond.