So I got stuck watching an old travel channel show from 2003 about Las Vegas sucker bets with the Wizard, Anthony Curtis, Bob Dancer and others. Anyway nothing ground breaking in there. Don't bet ties, don't take insurance stuff like that. But one thing on slots (I think Curtis said) was play machines advertised with 99% payback. Do these or others higher amounts still exist. Not slots at that percentage do not exist but advertised binding payback. Which casinos? I know the Rio has/used to have some but with the up 98% which really means nothing cause they could be 75% (Hey that is technically up to 98%!) I have not seen any in Vegas or maybe I did not notice them.
I remember seeing some years ago, but I thought I read that, when they advertise things like that, it's usually one or 2 machines in a bank that are set at that level, while the others might be set around at 80-90%, which would comply with some gaming commissions rule.
The Circus Circus has a whole bank of dollar machines that are set at over 97%. They're the basic single line, single reel coin machines. That's the best i'm aware of, unless you're talking about the rare progressive machine that is ridiculously overdue. The Lion progressive at the MGM that hit recently is one example.
I haven't seen any signage like that on the strip or even at Rio the last time I was there which was about 4 or 5 years ago. There may still be some off-strip. The rules were explained in the same show - if signage on a bank says "99%" then all the machines in that bank have to be set to 99%. If it says "Up to 99%", then only one machine is required to be set that way.