You'll get a share of the profits, it's just that the share starts at zero and you'll negotiate from there after the work is done.Sounds like an once in a lifetime opportunity to break into the lucrative Ipad and Andorid market.
People are either are in or out! All negotiations will be done at start! For instance and this is only an example programmers will be on the same % of Profits, same as Project Manager and whats negotiated at start will stay for life of the game and possible merchandising! The designer is one of the best graphic designers in the country who is already pitching to major TV networks for other progrects he is working on!, he is good and the Characters for the game are excellent. The game is a little quirky! it is a cross between to very popular games "Angry Birds" and "Plants vs Zombies" Anyone in game development knows that what sells is the icon and 1st 5 screen shots! The icon has to be sick so does the screen shots, people buy on impulse, and itunes according to how good the icon is! Thats a fact! I expect over 2,000,000 plus downloads I also expect that it will be across all platforms! and % of profits will carry across!