I have been to Las Vegas many times over the last 14 years and I've been an MLife member for several years now. Looking at our options for hotel stays for our next visit this fall and noticed something new (I think) on the MLife web site. They list "Prevailing Rate" and "Tier Rate" for hotels now. I don't remember noticing "Prevailing Rate" before. Does anyone know what the difference is and why they are showing two options? Thanks!