two things you are incorrectly stating here:

1 - you do not have to achieve 500 nights in 10 years to be Platinum for life. Those nights can be earned over any number of years, plus you need to have achieved platinum status for a total of ten years

2 - if you have 25 stays or 50 nights you WILL EARN Platinum status, not "may still be upgraded to platinum..."

Oh, and you do know that award nights count toward your 25 stays or 50 nights to earn Platinum, right? Just thought I would mention that since it appears you are "light" on current program details.

Anyways, you got the email and you are signed up. If you dont go for it,you are shooting yourself in the foot. Isn't this what you wanted?

Next time, avoid this public display and get educated on their website. Then you'll have knowlege and be able to contribute in a meaningful way.