In my experience if you sell it right people are fine with hourly pricing and an iterative model. "Quit whenever you want, we deliver usefully every time we bil

In my experience if you sell it right people are fine with hourly pricing and an iterative model. "Quit whenever you want, we deliver usefully every time we bill you" They want to see change as it happens, and eventually have that 'aha' moment where they realize they'd never have gotten from here to there if they hadn't gone through the middle part.