We can see here that the shortest post with 500 or less are on the top. As the post length increases, the number of posts is getting smaller.

Shorters posts may not be earning enough, but their participation rate is high, and there are so many contests where the min requirement is 150 words, that is why many people partake with the hope that they can get a nominal vote like $1 or $2. So you may not see huge reward in such posts, but definitely you can see more number of posts in this bracket. That is why they feature in the top.

Anyway, interesting stat.

Thank you.