Seulintse, there are many members who have been playing this game for multiple years. And most receive an average of one Nymph per month. This adds up. But yes, some average more because of reasons like Tournament or League wins.
Do not fret if your average is less. So was mine, for quite awhile, but I am slowly catching up.
By seeing how many nymphs a person has, you can rather guess at how long they have played Elements (or how good a player they are because of their winning competitions).
Janice