Well his price has dropped to 300. For 400 I would need a great Knight, he looks like a good Knight, so I might go 300.
Porn actors are human beings after all and while they may need to keep it hard for hours at a time in order to film, they do not necessarily bring that desire to stay hard to the individual appointment. As with most aspects of this habit, if you can afford it, it may not be too much. If you have to consider if it is worth it, it probably is not.