You can't claim to be professional if you have absolutely nothing to proof or show for to convince people to believe, and as such I'm very much sure that in such case, the winning aspect is very crucial when it comes to rating an individual as been either novice or professional gambler. Because despite the fact that majority of the recent casino games are been classified as been "luck base" games, I'm pretty much sure there are others that requires skills to be able to win it. Hence we have got gamblers who have been able to master the skill of playing those skill base games and win majority of it.
Yep.
Always win less isn't enough to show if you're profitable, initial and ending balance is, to know the results.
Professional gambler isn't about how good we can be responsible, not how long we become a gambler or how good our knowledge in gambling. But if someone able to make money in consistent, he's a professional.