First, it's important to realize that a porn star's job is NOT to be amazing at sex. It's to LOOK amazing having sex on camera.
That is a very different skill set. However, it's fair to assume that a porn star has had LOTS of experience having sex and as a result has developed significant skills on and off cam. In fact, many porn stars are amazing in bed. And a few that I have dated were, sadly, not much better than a starfish.
Now the same can be said for any provider. The best have developed skills through practice and incorporating partner feedback.
That means the value of booking a porn star is determined only by you and your personal desires beyond those offered by other providers.
- You may think it's worth more to you to fuck a given porn star based on her looks, reviews, or (on screen) personality.
- You may think booking a porn star means she has fewer "rules" about specific sex act. You still need to discuss first, of course.
- You may think that a porn star will be "better" at some kind of role play scenarios; daddy-daughter, teacher-student, cop-criminal, hot wife-cuck, etc.
- You may just want to be able to check a bucket list item.
In other words, the answer to your question "How do you justify spending that kind of money?" can only come from you for you.
Life is good
The Cat