You're right they are...and they're executing it very poorly too. They tried to automate the whole system instead of having an attendant at the garage exit but the few I've had to use don't work very well. You have to pay at a kiosk inside the casino and not in the actual garage in some places which means if you don't realize that when you're leaving you could have to backtrack by a quarter mile, pay, and then return to the car and finally leave.
My dad says people are mad mad mad about it too. Especially Vegas residents who go downtown to see a show once in awhile. I can't believe I forgot about that part!
It has gotten to the point where it is cheaper to take Uber or Lyft than to deal with parking - and I can get picked up/dropped off closer to where I want to go.