yes they take 20% of the buy in. That is how they advertise. But there is an add on and another optional buy that is like a second add on and the charity or the dealers get 100% of both of these. I cannot speak for the Chicago charity. My experience was with the Rockford charitable games. If you add up what you pay to get in they take about half of that number.
I agree that information prior to playing is paramount. That is why I posted. For others to know. I am not complaining. I would play again if I was feeling Charitable. But if you are on the grind, be aware of the 2 to 1 odds
you are laying.