It really depends on the market. I'm just comparing to Captivate and similar screen simulation software, really. If they can make a buck selling a $500 piece of software, you can do it on a smaller monthly fee as a SaaS for sure. I'm happy to see you were already planning these things, can't wait to see them! Perhaps you should start a newsletter, or a notification system so we're advised of your progress. I, for one, am very interested in seeing you evolve!
* Edit *: little feedback on useability: After grabbing a share link, I visited the URL and was very confused on which ones of the "Tutorial" or "Quick Guide" option was selected. You're going against the grain with these buttons, the "pressed" version should be the active one, and not vice versa.