"Basically, I am willing to give a significant % of the revenue of the app." I hate to break it to you, but (freelance) developers hear this all the time, and

"Basically, I am willing to give a significant % of the revenue of the app." I hate to break it to you, but (freelance) developers hear this all the time, and it screams "I want you to work for free". Either you're paying for it, or you're not.