In the year since your purchase, they released 2.2.11, 2.2.12, 2.2.13, all covered under maintenance. Maintenance is not just about the big releases, it's also about ongoing maintenance. At work, where I am the manager of IT, we went through a period in the early noughties when Microsoft Dynamics GP, our accounting and ERP system, was lucky to get a major update every 3 or so years and we were paying a whole hell of a lot of money for annual maintenance. But that got us bug fixes, tax updates, a certain amount of support including access to a knowledge base, and other maintenance items. Such is the life in purchase + maintenance software buying. If you want constant, ongoing feature updates, subscriptions give you that whether you want it or not. I'm not sold on SaaS myself, but I am kind of stuck with it.