So, if you expect your users to use your product for multiple years, charge appropriately. There's a difference between an update and an upgrade. A further di

So, if you expect your users to use your product for multiple years, charge appropriately. There's a difference between an update and an upgrade. A further difference still from a subscription. I think most people are happy paying a single price for a single thing and expecting to not pay for it again - but happy to pay for the next version, that offers something more than their version.