Yep. Evil, but possible.
I do believe that someone using a Google service will not get the same service (or service quality, in this case) as another person using the same service at virtually the same time. This is definitely true for SERPs (where we see a geographical variance at least) and Adsense (where even the same ads seem to pay differently). So why not also for statistics, or the delayed access to them?
AFAIK, the stats were never real "real time", and clicks and the revenue updated at different times - which could be an evidence for Google determining the EPC based upon the click itself, or other criteria (e.g. revenue the publisher has generated today, this week, this month, whatever).
By adding an extra delay randomly they make it even more difficult to compare results.
Did I mention that I believe that it is time for a suitable competitor to Google? Microsoft?