>That's when I show up again and sue you for my cut.

That reminds me of the blog of iD Software (maker of Doom/Guake). They would get occasionally some newbie with "a great idea", and he would want 50% of all the money for it.
It doesn't work that way. The money goes to the ones who do actual work, like coding for several years, testing the software until it works, getting it produced and available. One can't even patent an idea.