My mother in law does very well at the casinos. They leave the house with $100. She only puts $5 bill into a machine, and only plays .30 cents a spin. If the machine doesn't hit, she moves along. If it hits, she sits there and plays. She gives my father in law $50 and he loses it all. 9 times out of 10, she'll come home with $150+. So even though he lost $50, she won $100 and they come out ahead. We'll sit right next to her, and lose all night long.
She gets all kinds of free stuff from the casino, too. Free appliances, housewares, complementary rooms. Heck, she walks up to the pit boss and asks if she can have food money. He swipes her card and her husband's cards and puts $30 for food on each of them, and then they'll take us to dinner.
She is the only person I know that actually comes out ahead at the casinos. It's blind luck, I know.