I dont care aftermarket or not.
The reason Ferrari and Lamborghini dont have options for cams is because, 1) Nobody would be willing to fork out thousands of dollars for a new cam. And 2) the OEM cam profiles (And everything else in that engine) is already designed for maximum performance.
It isnt solely about lift and duration of a cam. Its how it is CONTROLLED. Why do you think Koenigsegg is investing so much time, and money into a camless engine?
I tell you why. Because getting rid of a camshaft completely, and replacing it with a solenoid over each individual valve gives complete control over EVERYTHING. you can adjust intake and exhaust individual of each other, and adjust int/ext on each individual cylinder.
For example. my old DOHC Mitsubishi Evo (Yes i know, a 4 banger) has a fuel rail, fuel comes into the rail, and straight into cylinder 1, but takes a little longer to get all the way to the back, into cylinder 4. This causes cylinder 4 to run a little hotter than all others. So i ended up having to pull a bit of timing.
If i had a camless engine. i could adjust when the intake valve opens and closes on just that 1 cylinder. Which would in turn cool it down, and allow me to run more timing.