I got the warning e-mail Friday night but I haven't been checking into any Topguest partners! (I've stopped traveling for work, and I completely forgot I was signed up for Topguest.)

In fact, I appear to only have three check-ins that earned points through Topguest, and they're from 2010 and 2011. That seems like a really low threshold to call someone a cheater.

Correction: Maybe seven check-ins. Found 200 points in my Choice Privileges for September & October 2011. (They weren't listed in my Topguest account because CP isn't a TG program anymore.)