Its an emtertainment expense. In no way should you ever consider gambling an investment. For me i like to gamble just like i lime to see live sports. I pay a lot to see those sports and in ruturn i get entertained. Likewise with gambling i lay down money in exchange i like to be entertained. No different.
Gambling is okay for you as entertainment and you don't choose gambling as anything other than entertainment, especially as a source of income. For those who choose to gamble solely for entertainment and spend a lot of money on gambling, gambling will become an expense. But there are many gamblers out there who see gambling as a source of income rather than a source of entertainment, and for them, it should be considered an investment.
Every gambler will have have to choose what they take gambling as , but as for me I will prefer to choose gambling as an expenses, if I choose gambling as an expenses I know I have to keep little money that I can afford to gamble with. It is a wrong idea to make gambling as an investment because one may decide to invest so much money in it and even if their is no winning you will just be having hope to get a win bot knowing that one is making a mistake.