Gutholz, honestly I never thought about the price, and to that extent you might be right.
I remember getting motorcycle slicks that were used relatively cheap, I desperately tried to gauge how much car slicks would cost on the internet, only to interestingly, find no information.
So it seems that their availability is low, and might cement your point.
However, that still doesn't explain why road supers are unavailable on the XFG and the XRG, as they aren't even a semislick by design.
On one hand I like the unlimited setups, but on the other it does tend to be unrealistic, since I've never seen a 115 hp hatchback with a fully adjustable suspension, brake pressure, and so on.
I'd still say that in the realm of people having essentially a double manufacturer racing cup (referring to the GT races) the act of having slicks isn't all that unbelievable.
Partan, the XFR car with rallycross tyres is amzing.
Sometimes when I'm bored I raise the suspension and put rallycross tyres using a tweak, and the result is fantastic.
I'd say that is also a good idea, but it would unfortunately also need a revised suspension for rallycrossing, which I whink would be some work for the devs. But ultimately I think that a rallycross base with the race preped cars would be great.