I think you're looking at it the wrong way. It's not about refusal. It's not (primarily) a red line where crossing the line means you get no sales at all from the X% of people that care. It just incrementally raises the bar that customers' varying levels of desire/motivation to buy the app have to clear before they decide to go ahead. There are many other factors that probably have a greater influence on that bar, including price, convenience of the purchasing process, perceived quality of the product, etc. But that doesn't mean smaller factors don't matter at all. To get a sense of how much they matter, you'd have to measure it, but I doubt that things like license management convenience are completely irrelevant.