Being a long term profitable gambler doesn't just happen, you may be lucky for a few days even a few weeks but in the long run there is no such thing as luck. A common known statistic is that only 2% of gamblers win long term, and those people in that bracket are not there by chance. I would consider myself to be in that bracket, although I'm certainly not a professional gambler, attaining that status is another thing altogether and requires a different outlook mentally, one I'm not totally comfortable with. Having said that to be a professional you'll need to be in that 2%.