Ice Tech rotors are expensive and resin pads are cheap. It's a simple formula. Wet and mud will indeed wear the pads out more quickly, but as I said, they're really, really cheap. If you want big bite, get some sintered pads and cheap rotors and get used to replacing them. I use resin (aka "semi-metallic") pads from whoever is cheap (Shimano, Koop Stop, Giant, TruckerCo, etc), and get past 10k miles out of a front Ice Tech rotor, and near double that out of a rear.

There's a seller on Amazon peddling 4 pairs of resin pads for like $20. That would be my CX racing pad of choice. They only need to work well for an hour at a time.