You can stick Karts. I tried, I really did, but I couldn't get into the whole no gears thing. Sent me to sleep. Sure the wheel to wheel racing is good, but meh, the rest of it, I'm not interested.
Besides, you can own a rather decent dedicated track car for what a decent Kart and trailer setup will cost. And running expenses are actually fairly similar if you want to compete for a place in Karts.
Karts are not cars!