Advantage gambling as the average person knows and plays it is not a good way to make a living. From what I read here there might be some people that know how to play with advantage, but not for a living. That being said there may be some who maybe could, given different circumstances. If you have an established career and a family, then there would be no more of a worse move then to quit your job and try being an AP for a living. Unless of course you could leave your job and still manage your current lifestyle through other avenues of income not including advantage play. But even then you would not be able let playing eat up your personal expense money or your through.
A different scenario is one of a young person with some real skill and a hefty bankroll with no real financial and or family responsibilities giving it a try. The problem here is that usually very few meet all that criteria. Some might have skill but no real bankroll, or any other combination without the whole package.
Another very important trait that I believe is helpful is, not liking gambling. You know if you fit this bill. Most new AP's, long time part timers, and beaten down pros love the rush of the gamble. That can't be what drives you, and it will keep you in the game even when you shouldn't be there. I'm not saying be an emotionless robot, thats not probable either. What I'm saying is in a professional sense of playing, a win is a good day just like a good day at work, and a loss is a bad day in the same manner of thinking. If you live and die emotionally with ups and downs of the game, you will burn out and forget why it is you play this game, but still not be able to stop.
There is a way a lot of pros play this game without too much worry of living day by day. That is they are staked, or backed by investors. Its sad to say but true that some players are better marketers than players, and as long as they can sell themselves and a system, they will always have money and be able to play. That is also another avenue most either don't have access to or want to be a part of.
Its true there is no pension plan or medical benefits for AP's, but that doesn't mean you can't set yourself up just as many self employed people do. But from what I've seen the line between a gambler and your average AP is pretty thin as what usually drives them to play is the same. That being the case I don't think playing part time for either is a horrible idea, but obviously it should be at least a little better for the AP. Either way though I think its a terrible idea for most to try to make playing their primary source of income. Maybe not all, but most from what I've seen.