Excellent point... People are retarded...
Honestly, if you knew how bad it is to "take it into VTEC" when the motor is cold, you would never do so...
It's engineered to "turn on" when the oil has come to the proper temperature, which equates to the proper viscosity...
For many reasons, the computer limits engagement of VTEC when the engine is cold. Among them are:

-Proper viscosity - a cold oil isn't "thick" enough to transfer enough force to engage the VTEC system. Besides a cold oil is too thin to properly lubricate the engine...
-Engine performance is not at it's peak, until the engine is at operating temperature.
-Cold is the enemy of ductility... The pistons, connecting rods, etc are all more brittle when the engine is cold. Why beat it when it is more susceptible to damage?

Basically, there is a safeguard against complete idiots who might think it's a good idea to rev the hell out of their motors when they are cold. LOL