They are offering more benefits (maybe Ambassadors) at the 100 night level.
This is from tomorrows WSJ. Fair use excerpt.
Starwood on Wednesday is enhancing its loyalty program by adding features for frequent travelers, such as rolling 24-hour check-in and check-out times and personal travel assistants, dubbed "ambassadors," company executives said.
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The use of the perks will be determined by the frequency of stays, with customers who spend 100 nights a year at Starwood properties qualifying for the highest level of service.