I'm actually very petty, so here I am providing proof and waiting for you to admit you were wrong.
And when sorted by top 100, lowest makes 1.6k a month.
For adult writers...
When sorted by top 100, the lowest makes 759 a month.
In other words, if even the bottom 100th non-smut writer can make ~$1700, almost $1k more than the bottom 100th smut writer, it's not hard to see which genre sees the most success.
EDIT: AND LMAO the "highest" adult writing content creator isn't even a writer, but creates erotic ASMR.