The way you are going about this post makes it look as if you are just hearing about the whole cash out option although for most casino its a recent development but it's something that have been on and helping out gamblers in some way and also a tool for the casino to salvage some chances of big massive to hit their casino because I have seen more than enough cases of which myself am a victim where you get to cash out sometimes like 20% of what you are supposed to win and the game still played through but the rate is depending on the number and odds of the games remaining.