in my opinion, that is exactly what they do once they got hold of your money: make it hard to cash out and tons of excuses,
while they spend your btc or invest in whatever HYIP schemes; often, that indicates possible insolvency;
when there's no transparency about where exactly is your money at this point and time, there's no accountability;
also, as they say - you must gamble only for the money that you are ready to lose [most likely you lose];

i don't have a problem with these things, i know the game i'm playing; but for naive people, just think before you leap!