Yeah, I love to scratchbuild stuff and make up my own rules, but unless people actually pay FW for the models, they aren't going to be inclined to do anything with AI.
I'll add on...
1. It doesn't require terrain to play!
2. Quick, quick, quick! (Games can be set-up, played, and packed up in less than 2 hours!)
3. Fits great into existing campaigns!
4. Helps create the full picture of 40K combat
5. Easy to paint. Few models per side, and relatively flat surfaces.
6. Easy to transport as you have a handful of models
last but not least....
FUN!