Note that we both argue against a support model. That's a very difficult, unscalable model. Instead, I encourage you to think of your hosted version as the primary, main version of what you do, and the open source version as something that you also release. And remember to hold something back for enterprise open source customers who need something more.
Also, I wrote a long post about open source businesses. http://werd.io/2015/open-issues-lessons-learned-building-an-...
And here's a different take, from Lightspeed Ventures. http://venturebeat.stfi.re/2015/12/06/its-actually-open-sour...
Note that we both argue against a support model. That's a very difficult, unscalable model. Instead, I encourage you to think of your hosted version as the primary, main version of what you do, and the open source version as something that you also release. And remember to hold something back for enterprise open source customers who need something more.