It could be, but it's not required to be. You actually may not need hundreds or even thousands of dollars, and you can invest as much or as little as you like. You can play with whichever sums you feel comfortable with because most casinos have fairly low minimal bets.
You essentially have total control over how much you expend as long as you establish a budget and quit when you have used it.
You essentially have total control over how much you expend as long as you establish a budget and quit when you have used it.