There's alot of fan supplements out there on the internet for roleplaying games. Mage converted to BESM! Fading Suns converted to 7th Sea! Mage converted to GURPS! (I've seen all three!) Bigger and better robots for Exalted! Near-infinite D&D spells, feats, and prestige classes!
I do not want to write a fan supplement. I do not want to work on your game on my own time. I want to be working on my own game, which I can publish, with my own name on it, funded by my own creative efforts, and putting a couple of bucks into my own pocket. If I'm going to be spending dozens, or even hundreds of hours on something, I had better be the one reaping the rewards, not you.
So I do not want to augment your Already Published and Famous Role Playing Game. I want to write my own from the ground up.