Quote Originally Posted by Kosmos992k View Post
snip
it's just easier and faster to look at big pictures (gear change, change in big numbers like mount count, minion count, levels) rather than nitpicking exact number changes.

Anyone who play the game at least a few hours in the spawn of 2 month is likely to have changed at least one piece of gear. Pretty easy stuff to use to figure out active accounts. I'd een go as far as saying that the underestimation (people not progressing on any level for the entire scan duration) is beaten by the overestimation (people can come in and out in the span of 2 month, and may not be active anymore when the numbers are compiled)