When I originally posted about MGM Resorts’ Mlife program I mentioned that you could earn Tier Credits for retail, dining, entertainment and lodging expenses. I left out one detail though, because I hadn’t been able to verify it.  Now I can add it.
Your earn 25 Tier Credits for every dollar you spend on dining, entertainment, spa services and lodging when you track it with your Mlife card.  Please note that shopping purchases are no longer part of the program.  As a general rule though, if you can charge it to your room, you can get 25 Tier Credits per dollar for it.

If you never gamble, but want to get the perks associated with some of Mlife’s higher tiers, this is what it will cost:
Sapphire: $0 (everyone starts with this)
Pearl: $1000
Gold: $3000
Platinum: $8000
Noir: $40,000 (Note: Noir became a ‘by invitation only’ tier in 2013)

For more information on the benefits associated with each tier, visit the Mlife Tier Benefits page.