Seems contradictory but theres also the possibility of just being lucky. If continually gambling, never taking cash off the table and hoping for the streak to continue then that could be seen as a problem gambler. Not knowing or being able to stop at logical points such as being tired or having already done that well that evening would suggest possibly a problem could develop not that it must do so. Always try to bet less at times, I do know some people only want to bet more which is where it will lead to a problem I think stay regular and stick to some plan dont just react in a moment.
I would still differentiate between a successful player and a lucky one. Luck tends to run out and rarely lasts very long. Usually these are small moments. I would call a successful player a professional who has a clear strategy that allows him to have income over the long term. Of course, luck as an element of this can also affect success, but it is not of paramount importance.
I would call a successful player partially dependent, because success is achieved by working on oneself for a long time, and a professional will not be able to achieve this success if he does not experience passion and interest in the game. Therefore, I would call it a controlled dependence, when it is necessary the switch turns on, and when it is not necessary it turns off, if you understand what I mean.