Purely anecdotally, but I can think of many friends and relatives who have gone to burning man in the past and are nowhere near the top 2-5%. Last I checked, my dear sister (a self described burner) is living out of a van and selling jewelry at concerts/shows to make a small income.

Also anecdotally, those same burners have mentioned that they are less and less interested in going to burning man based on their recent (negative) experiences in the last 1-2 years and are doing more burner-like things locally.