I rode track on my sportbike for 3 years before I stopped. I loved it.
Two weeks ago I did my first DE event at one of the tracks I used to ride on. I also loved it. These cars are unbelievable. I learned so much about what the Boxster can do. I know I didn't get close to the edge of her performance envelope.
There are risks, however. One car did roll and was totalled while an instructor was driving it.
I say go for it. If you can afford the maintenance and the trackdays do it.