Just about every football ground I've ever been to (and it's a lot!) from the Premier league to small regional leagues has a raffle of some sort (though it's usually called a 50/50 draw or somesuch) which is drawn at half-time - often by a retired player or other local 'celeb'. They do it for the same reason as Folk Clubs - it's a way of getting another pound off those punters who wish to buy a ticket.