Originally Posted by
Aurboth
...I have two accounts, both at level 50, with approximately the same number of buildings. I bought gems at the 3x sale just prior to the event only on my Zeus account, and I finished the achievement at the same time on both accounts. That should be an adequate case-control. In an alternate case-control, my wife is level 50 and bought gems, and is on the same server as the account where I did not purchase gems this time. She finished the achievement on the day following, so would fall within an appropriate random range variation...