I enjoyed my play at Harrah's, Paris, and Aria. Aria charged only one dollar on the commission for my 25 dollar bets. Paris and Harrah's have quarters so they charge the full dollar and a quarter. It doesn't seem like much. But, I like to take every advantage that I can from the casino. Bellagio, Venetian, Palazzo, Aria all don't have the quarters. Harrah's, MGM Grand, and Paris do have the quarters. Caesar's and Wynn had high limit games so I don't know what they do with the quarters.
I just got back from a week in Vegas. Sorry to report that Venetian has removed their tiles game. Also, Harrah's has renovated their Asian games area and now has two tiles tables. I didn't notice any changes in the tiles games at Bellagio, Aria and Paris.
As both a player and former employee there, that surprises me. I'm sure one reason the Venetian tile game may not have done well is that there is a lot of foot traffic between the table and the wall, much of it bumping the player's chairs, which was very annoying. Anything they replace it with will have the same problem.
Hopefully the Palazzo game is still there.
Is the Rio game there 24 hours a day? I have decided to learn the game and spend my week there perfecting it... wondering if I'll have to time my playing around it. I'd love having a midnight game there.
I have played tiles at Rio at 1am at least once in the past year. Rio seems to stay busy late, but of course I can make no promises on their behalf. I do think if you ask ahead about it, they might accommodate you. FWIW, Harrah's tiles have been 24/7 every time I've played in their Asian pit. They make a point of staffing it.