Well no, this survey isn't meant to be an actual study. It's for entertainment purposes only.Still, no evidence to dispute the common wisdom that D&D is rarely played above 15th level.
It's all anecdotal, but claims that it's not true have even less support behind them.
Huh. The number of characters of 4th - 8th level is greater than the number of all other levels combined.
I wonder what this says about the "sweet spot" of 5E.