I suppose track days could get quite expensive. I think it'd be worth it. I wouldn't mind upgrading my braking system. You wouldn't necessarily need to ride around on the same tires you race in. You could have a set of wheels and tires you use specifically for the track and swap them out when you get back home.
There are some logistical problems with the brakes, though. Changing them might require a larger wheel, so you'd end up getting two sets to be able to swap out. You would undoubtedly do brake jobs more often with higher performance brakes, especially when driving harder than normal. But to be able to drive hard is why you would go to the track in the first place.
