Ask any go kart racer what allowing prep did to the sport. Honestly it’s more expensive than traction control. It’s not a 1 time purchase. You will need different preps for different tracks. Different preps for track conditions. You’ll need more tires(you cant just slap dope on at the track it has to cure). I personally know a few guys who make prep. As far as price I’ve heard $500 a gallon. But I can’t with certainty say that’s accurate. But it would be no different than tires. It would be a monopoly where they could charge whatever outrageous price they wanted and you wouldn’t be able to compete without it. The other thing is I know one preper literally takes the whole tire to treat it. It’s not as simple as just rolling it the outside of the tire anymore.