I guess one's attitude depends more on the society he belongs and values taught by parents. For me, my religion plays a very less role to define my interests and desires. I have been gambling for past 4 years now and running my expenses through gambling wins. One of my uncle fulfills his desires from money from gambling which wont have been possible looking at his current earnings except from gambling. I personally think gambling money is not a stable source of earning and is not dirty at all . You can donate some of it if you feel its dirty and feel better about yourself !