I won't be giving it back to them.
A friend of mine won 10k on a football bet. The bookies tried all ends up to get him to open an account...he bought a car with the cash.
It'll be a slippery slope into problem gambling from now on, Melv ;-)
When National Lottery tickets went up from £1 to £2, I hesitated to continue buying them but decided to have just one go at the higher price. I won £136, which they've had back with plenty of interest since then, as I've carried on forking out £2 twice a week but, alas, with very little luck :(