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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.
I think just the withdrawal just might be a problem to the people who want to save their money somehow like they have less than 20 dollars and they want to withdraw because they will use in other ways. We cannot avoid this kind of behaviour even though they lose a lot still they want to save just a small amount we cannot blame them. Still best ideal thing to do is always provide the minimum withdrawal with fee so we cant regret to withdrawing our funds this is the reason why gambling conciously.