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I think minimum withdraw is not really a big problem.
Most of the casinos right now only have a minimum withdrawal of around 10-20$, and yeah while you don't want to gamble anymore but the fund can't reached minimum withdraw. Rather than better more ended with losing, why not deposit the rest of the balance you need to reach minimum withdraw.
Yes they have set up withdraw limits not too high and small gamblers can easily withdraw the profits they have made in gambling.The $10-$20 is also set up keeping up the transaction fees due to which they must be greater than the fees.So it is not a big deal for players and they can afford it.