If you're a company making Veblen goods, the last thing you want is to make something that's worth all that money. Then it's not a Veblen good any more!
Shifter carts are reasonably cheap and they're a hell of a lot of fun and adrenaline. If you truly like racing, that's where a lot of the F1 guys start their careers. Not the safest thing in the world, though. Spec Miata is way more tame, relaxed and safer.
I've had a lot of fun in shifter karts, but never been on the track in a real super kart.
The world is such a weird place.