You should always Play for fun whether it's Slot's, Roulette,
blackjack, Poker or Sports Betting, I never gamble with money I am afraid to lose (scared money). When I go to a Racetrack or Casino I will take enough money for Travel, Food and drink expenses, and a separate amount of cash in another Pocket I call "Mad Money" This I am willing to throw away as to me it is dead already.
If I should lose all of it on my Day/Night out then that is fine, I have had a bit of Fun and still have a Taxi fare to go home with. If I started to chase my losses with the Money I reserved for Food and Travel then I know I am headed for trouble, I used to do this in my single days losing more than I expected and had walked of hitched a ride home, which is no fun in a Thunder Storm.
Gambling Responsibly is nothing new and there is no secret to it, You just have to be aware of what you can afford lose. I once went to Haydock for the racing and when I was returning to a course bookie to retrieve my winnings I met a friend of my Daughter's and it seems she bet on the same Horse I had when she asked me how much I had Won, I told her £100 as the horse won at 5/1 I had £20 on the bet "Oh no" she said "I couldn't possibly risk that much on a Horse" I told her it didn't matter as it was out of my Mad Money pocket and explained my system to her She was amazed at how much I had been willing to lose on the Day.
It really is unimportant what figure that was, as I felt it was a reasonable amount to gamble with and possibly lose, but that one win doubled my Mad money on one single bet. To some people £100 is a lot of money, but to someone else it's "Peanuts" It all depends on how long it would take you to earn that money if you had to work for it, and if you can afford to burn it.
Basically it is all about Control! If you are in Control of how much you are willing to lose Then you can relax, and have more confidence in your actions, If you lose that Control then bad things start to happen.
When the Fun Stops, STOP!