Also doesn't it bother you that your "job" doesn't add any contribution to the society? I mean you're taking money from the casino and that's it - playing your edge. At least a trader provides liquidity in the markets for the hedgers while a gambler doesn't have much impact unless you do something significant with the profits which is another story I guess
I'm not OP and thus can't speak for him, so it is up to him to reply to your question as he sees appropriate
However, I tend to think that you are following a very narrow approach to this matter ("taking money from the casino"). Essentially, you are looking only at one side of the equation, the "take" part of it, to be exact. We don't know how OP manages his money which he wins through his gambling activities. And technically, it is not just about money
Indeed, he makes a living out of it but if it goes beyond that (which seems to be the case here), we should also consider the "give" part, i.e. how he spends his income other than for mere sustenance. In other words, yes, it is another story but the one which could make all the difference as far as "contribution to the society" is concerned