I'm sure you're right. Nevertheless the trend would be captured & this doesn't seem to be a reason not to implement what we have. As a potential issue, it currently exists & would continue to exist in any peer to peer system.
I'm sure the trend would be visible, but would it be meaningful? Basic Elite accounts used to be available discounted on Steam for, what was it, $5 or so? Many people bought loads of them. Tactical useage of rarely played accounts combined with VPN and host anonymisers could make that trend take a long time to appear.
You are not wrong - the statistics will always appear eventually - but those people determined to be lulzbunnies, will always find ways to be lulzbunnies.