Who actually uses launch control?

[Dum-Dum]

I've gotta say I'm not sure how badly it would toast the engine if done right. Your little pre heating/keep the engine spinning at 2-3k injection needs to be nothing more than it would usually need and gives EGT of maybe 400* guessing off peoples EGT gauges and that would be no more than it usually makes then the stuff your firing out the open exhaust valves I'm not entirely sure would combust as your loosing compression all the time and its not a high temperature or much oxygen so you have no chance of burning the valves IMO any more than a coaling XUD

Or is that completely wrong?