M==C==A

It is my undertanding that the GUIDs are in fact hashes that are created from CD Keys. I've upgraded my PC on numerous occasions, and have gone through a few OS swaps(XP to Xp x64 to Vista to Vista x64), and it only shows the GUIDs that I've purchased. Question is, how can anyone be seen using more 13 GUIDs in 3 days? What are the chances of playing on 13 different machines all running seperate copies of the game in the span of 3 days? MCA