There's a problem with your offer. I'll try to explain.
Usually this kind of offers is just a gentle translation of "Hey, will someone work for me for free?"
Everyone have cool ideas for games and everyone think their ideas are great. The hard part is to transform the ideas into a living game.
From my experience the best way to work is to bring money to the table. If you have an idea and believe it will sell and bring profit than developers will see you really believe in your idea and will more likely to join you.
People and mostly developers don't like to work for free. If they keep on producing games for others for free they won't make a living.
Hope this makes sense.