Unless your app is trivial it won't appeal to only one type of person so you're going to have to model multiple types anyways. For instance, the inbox cleaning

Unless your app is trivial it won't appeal to only one type of person so you're going to have to model multiple types anyways. For instance, the inbox cleaning utility mentioned - it could be used by busy CEOs whose time is money, and by computer-illiterate people like the stereotypical grandparents who need frequent access to the same tool despite having ample time to shop around on price. You need to advertise to both group independently or you won't get either. So model the people who don't like your software too, and their desired payment options, as more data points from which to understand your actual best market.