Originally posted by Japher
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As an investment, casinos are much better in terms of your likelihood to make money; casino games vary wildly on their expected payoff amounts, but most games pay at least 80% or so, and plenty of games pay in the high 90%s. Even many slot machines pay very high percentages. When the percentages are that high, a lot of people will win (net, in one session).
However, casinos also allow you to gamble a lot more money in a short amount of time; I doubt you can realistically buy more than a hundred powerball tickets or so at once, and even that's only $200. You can put a $100 token in a slot machine, IIRC, and lose it in about 2 seconds. So in terms of "potential damage", casinos are probably worse, but if you're not an addict and play responsibly [bring $200 and go home when it's gone], they're probably better.
Of course you can make money at poker table games, but unless you know yourself really well I don't recommend trying it - even if you're good at online poker. Treat it as entertainment until you've done it for a year or two and have a good idea of when/how you can win.
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