I'm assuming that this is another case of someone who is marketing their OF and isn't looking for actual in-person business. I've seen him doing content shoots with danthemann and zacattacks amongst others.
The only speculation I would make there is that it isn't something he's worried about, since the post hasn't been deleted.
Funny, I saw "Sam Banks" and was thinking "Calvin Banks", though I guess Calvin isn't escorting these days.
On the question of taxes, I will only say that I am not an escort and will leave comments/speculation about this question to people who actually are escorts.
Assuming it was within my resources to pay $400 an hour, then for me whether or not it was too much would depend entirely on the quality of the experience.