I image it simplified thus:
Say you are betting $1 a spin. Every time you hit spin you pay the Casino 5 Cents. And 95 cents of that goes into the kitty to payout to players.
So deposit $100 make 100 spins at $1 each and the casino keeps $5 and theoretically you get $95
So now you have $95 make 95 spins, the casino keeps $4.75 and you are left with $90.25 and so on....
Continue on and you have paid the casino $100 or so whether you manage to cash out or not. This is especially true when you consider bonuses and wagering requirements. Consider that you have deposited $50 and gotten a $50 bonus with 20X play through of $2000. $2000 * 5cents is $100!!! The casino has just paid itself your $50 and you have generated income for them off that bonus removing the 5cents every spin from the overall payout!!!
It gets even juicier if for some reason they get to confiscate your winnings from regular play. No one every mentions where that money goes. (not referring to Random Jackpots here)
Makes me wish I owned a casino 
Again this is just a theory I have, but if you think of it, its mathematically sound over the long run. I could put it in far more eloquent terms but its late and I am at work.
Have you got another plot of land I can buy? This one doesn't have near enough fertilizer.
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