Given the current user base, most users will never see themselves high up on any of the all time lists. They may briefly find themselves on the last 30 days in the popular tags or the weekly/monthly/quarterly/yearly groups.
However, if you break down the lists by location, you might be in for a nice surprise (unless you live in Reading, Rouen, Forest of Dean or Willemstad). I know the location data isn't perfect but perhaps it will give people an incentive to put in cleaner data.
Also it doesn't have to be at location level. It could be done at the national or continent level, to remove advantages for small areas.
TL;DR: Add regional views to the "user leagues" and "tag top users."