Because they are used to that by now. Maybe offer a basic version for free and premium addons for a fee? And in the future I suggest first asking some potential customers before making your product. Will save you some time. But did you ask ALL the people that might be a customer? And the are also other organizations besides schools and universities that need to make ID cards. Maybe they are interested. Or change you software a little and you might be able to apply it to another problem?