I am against mixing 30k and 40k but I also think the overpowered/bamboozled argument is ludicrous. I just think mixing em is gross. Same reason I don't mix sodas at the fountain.
See at least this argument I can understand, I don't agree with it but I understand it.
Wargamescon 40k Judge
caldera40k.blogspot.com
Hogleg - "only in my head someone bought CRP's OOP Wraithlord then stuck its toe in cover."