Sin it can only be for religious fanatics. For me, this is a great opportunity to have fun and win a good amount.
More like great opportunity to lose your money and be pissed of about betting your money. I never found gambling fun at all. I doubt that most people do. Most people are just there hoping that they are going to go home with money. Tons of things can be done to have fun, maybe not earn money though. Gambling addicts are greedy. And being too greedy or too addicted to gambling will lead to you doing things that you're not supposed to like stealing money from your family just so you can gamble. This is a sin. Greed leads to committing sins.
although ever one in gambling like to make money, but some people do not have any strategy or planing in gambling and therefore they are mostly losing money, while some people play gambling with a good strategy and planing so at least they can prevent themselves from losing money, i think it is totally depending on your and not and the way you are playing gambling.
Strategy is not only for winning but also for minimizing our loses, everyone must have a strategy in gambling to last in the game, without strategy will make you desperate and you might just be affected by your greed every time you lose. When you learn from your mistakes that is a big development of yours as a gambler, most of us keep doing the same mistake over again but matured people do adjust.