Over teh last year I've signed up to about a dozen bingo/casino sites through cashbacksites such as Quidco which give you a £10-£15 cashback payment just for depositing and playing £10 with a site. On the bingo sites I played my £10, ashed in any winnings and left, then moved onto thenext site. I probably broke even or maybe lost a few pounds but after the cashbacks I made a fair net profit.
Anyway, the bingo was quite good fun. You can but up to 40 tickets a game but the computer marks the bingo ticket numbers off for you and tells you when there's a winner. I can see how people less mean than me get hooked.