mlife status doesn't offer much in the way of level-based perks.
CET is the only program that has value without gambling - the resort fee waiver for diamonds.
the line-cutting benefit is also nice for diamonds - many times it's not really "advertised", ie there's no sign saying "Diamonds/7*".. example - GR burger at PHo - just walk up to the counter, show your Diamond card, and ask how long the wait is. worst thing they can do is point you to the line out the door, but that's never happened to me.