Ron on the latest trend:
Look at the iOS and Mac App Stores. Applications come with ongoing subscription price tags. We are renting the software we use. Adobe and Microsoft made that method mainstream. Adobe’s Creative Cloud suite of apps is about $50 per month. Stop paying the rental fee and the apps will not work. Microsoft’s Office has a similar model. Pay by the month to use apps on every platform, but stop paying and there is nothing to use.
I have half a dozen subscription apps already.