Sometimes it irks me when people I know full well hardly do gigs and call themselves a "professional" this or that. In the states, I have heard the status of "pro" is defined as someone who makes most if not all of their living from some form or something or other. So I suppose if you do nothing with your life and do a performance once or twice a year and they pay you, that definition holds true. Ah loopholes.
In other places, I have seen it referenced that if you are proficient at something you are a pro. I know many people who are great technicians with cards but can't entertain a thought let alone a group of people. Does this make them professional? I say no. I'm not saying you need to be a ninja master of what you do, but you need to be coherent in as many of the aspects of what your job entails. (This of course is mostly geared to the entertainment business. Not a lot of lawyers or accountants throwing this term in front of their monikers.)
I believe it is up to you to decide but you need to be honest with yourself. Just because it sounds good on a business card doesn't make it right. Sure, you can lie to yourself but eventually you will be found out. The proof is in the pudding... or the yogurt or wherever it's supposed to be.
Put that in yer pipe and smoke it.