NDAs I think aren't so great either, even if a developer passes up, it makes it hard for them to recommend a someone else
If they don't pass it up, it makes it just that bit more stressful having to work very hard for an uncertain reward
Limited equity Some cash, even if it's just a token gesture (get what you pay for) A lot of gratitude Be more open, if developers can talk about your idea you might get people asking to work with or for you
Unless you've got the financial clout to go after anyone who breaches your NDA I'd guess you could hire a whole team of developers full-time. If not, well someone like Apple or Google will drown you in court if your idea really is that ground breaking. :( sad way