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Interesting.... I work with a group out here in Cali that hosts track days pretty much every weekend.... and I haven't seen any warped rotors unless someone drove the piss out of them, and then someone being an "Amazing" driver.
Don't know what kind of rotors you're referring to, again, the pad/rotor match-up may be the culprit here (read previous post for a brief on that). Why don't you give DBA a call, since you're an aussie.
In regards to slotting/drilled.... the Drilled weight savings are negligble. The benefit to drilled rotors is the cooling of the rotor itself. Now some say, that due to less mass of the rotor, it will heat up more quickly, negating any benefit from the drilling.
Slots are designed to allow the escape if super-heated gases during extreme braking (the same benefit is claimed by Drilled rotors). The pad will greate a layer of gas, separating it from the rotor, rendering it in-effective. The slotted rotors are designed to not only alleviate the escape of the gases, but also to shave the pad, ensuring a clean (read not glazed) surface.
OEM... well you'll find it all. AMG's have cross drilled. MBZ swears by these, as the drilled work better with cooling. E63, CL63, and any other 63 have massive brake packages.... all drilled. One of my close friends is a tech for MBZ dealership, and in 6 years, has yet to see a cracked rotor.
Again, if you claim to have numerous people telling you that they had warped rotors, before blaming the rotor's drilling/slotting... look at the other factors that would create failures. They are as follows.....
1. Heat: the rotor operated under extreme temps outside it's designed temp range. This could be caused by numerous factors such as incompatible pads, insufficient pad material, keeping the pad pressed against the rotor while extremely hot i.e. stopping the car while rotor and pad are at extreme temps thereby creating hot spots, and uneven heating/cooling areas... or my favorite, driving with the left foot on the brake, while pressing the gas at the same time.
2. Thermal Shock. Extreme temp changes to the rotor. Driving/stopping in a puddle while rotor is extremely hot.
I really can't think of many more reasons for rotors failing. Again, failures are rare, and if they do occur, almost always because of some other factor, not the drill/slotting.
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