Number of Translation Tiers
I remember reading here on the discussion board that there are 25 language levels. How many translation tiers are there?
As has been said, they are in theory (and probably in practice) endless. However very few people seem to make it much over Tier 10 without being part of a group of peers working together, reviewing and upvoting each others' work.
I for one would be very interested in seeing graphs showing the number of people at each tier for each language. I suspect it would be quite interesting.