Trouble is, it's impossible to not gamble at all, because life obliges you to constantly make choices based on insufficient data. E.g. "do I quit this secure but dull job for that one that looks more exciting but which might leave me jobless" "do I buy property now because prices appear to be rising so fast I won't be able to if I don't, or do I hope prices come down again" "how do I invest my pension fund?" etc.
For that reason I'm a bit puzzled as to how so many religions make 'gambling' a sin. If it's against his rules, why did God make it compulsory then, eh?
(But I never bet anything on lotteries and such like...if I were to, I'd at least pick some sports gamble where there was some extra entertainment value in it).