Rotors don't warp because they have holes or slots in them. Rotors warp due to improper torquing of lug nuts. Yes, they will warp in one day if the wheels aren't torqued down right. I know about the fiasco revolving around the shop where antarius had his rotors put on, I wouldn't be surprised if they just used some air tools to pop the lugnuts on without checking to see if they were torqued to spec.

Brembo continues to market them because a plain rotor is a $30 OEM-replacement part while a drilled/slotted/dimpled/whatever rotor is a "performance" part which can be sold for quadruple the price.