I've eaten at pretty much every outlet at Aria, Bellagio, and Park MGM in the last several years. It's inconsistent, but I am sometimes asked for ID for room charges, regardless of high end/low end.

[Mod]
In any case, this is the Rio thread, so let's focus more back on the property, and less on low-key judging people for having fewer or different experiences or being unaware of things.

Periodic reminder that FlyerTalk also has a Destinations / Las Vegas forum and a Gaming Loyalty Programs forum for discussing general experiences in Las Vegas casinos and/or aspects of various casino comp/loyalty programs.
[/Mod]