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So, sure there is money in it, but many, many people have driven revenue for the scum that run those sites, and never saw dime #1 from their work.
I think s*x would be the better bet, because you can deal with a US company, that is, if you are only interested in looking at a huge market with lots of $$ involved.
I believe it is dying slowly....the situation can change if the Government introduce Legalized Regulated Online Gambling Industry . I am sure it will be a big tax money generator for Uncle Sam