In order to get the most value, you should purchase a subscription as early as possible in the site life cycle. The emergence of issues that require support is unpredictable by its very nature, so attempting to artfully time the purchase of a subscription is a futile exercise that can lead to costly and wasteful delays.
Most Geomajas GIS web applications are never truly “done”. They iterate continuously through new use cases, experience design, development and content creation, testing, staging, release to production, and optimization. And even if development were theoretically declared to be “complete”, original content and user-generated content are always growing and interlinking in an organic fashion. This can impact site performance and stability and create new intersections with previously dormant software defects.