So, this was the subject of conversation. Why are people not playing high-level D&D? This was prompted by this post on ENWorld, which was based on stats found on D&D Beyond drawn from users making characters using their tools.
The short version of the analysis is that after 10th level, the number of characters drops off dramatically. The majority of the characters are between 3rd and 6th levels.
This has prompted a bunch of people to put forth their own ideas as to why. Far be it for me to buck a good gaming trend. Here is my list of reasons why people are not making characters for higher-level play.