I do, sometimes, but not the headaches. I really enjoy the car N/A because I can focus on driving, not if the system is coming apart.
If this engine goes, I'll move to a VVT engine with bolt ons.
For the price of a GOOD F/I systems that could handle the rigors of track use and still be reliable for day-to-day driving, let's say $5000-8000, I can get a decent tow rig to ensure I would be able to get myself and the car home from the track regardless. I can also use it haul stuff for the home and my dogs to go on hikes.
Do I miss the power? Yeah, but I enjoy creeping up on cars I have no business catching in my 1.6 because I am becoming a better driver. That's priceless.