A sudden thought

I passed a betting shop and wondered what it was that kept people going. I then walked past slot machines and those grab machines where no-one ever seems to win save the machine owners. It was then I heard the two sounds which probably spur many on; the first was the sound of the pay-out from a slot machine and the next was the cry which went up, "Here we go!" Interesting, a presumption this sound will come again and the hook is in.