hey, look at it this way...they're WAY cheaper than a Porsche Cup car!!!
They are light, tires are small, brakes are small, and you only have 4 cylinders.....there are just less moving parts and they are very simple cars, using a Toyota stock drivetrain and motor, not one that's been modified to be a "race motor", so you don't have the ridiculous rebuilds that are required with other race cars. From my experience, and knowing a bunch of people that own them.....just drive them until they break. I've seen very few problems.