Mostly aiming at profit rather than just for fun, However mostly don't end up with any.. The rule is you shouldn't (regardless if it's for fun or profit) gamblle allot of money (any amount you consider allot) since gambling is a game of unequal chances with the house edge... it should just be used with minor sums of money that you are willing to bet with.
That places you more on the playing for fun side dude if you're playing with that mindset. People who have the intention of earning would shell out large amounts of money because that's how you'll earn also. If you have the mindset of playing with an amount you can afford to lose, you're in the safeside and most likely would be playing for entertainment