I've often pondered the idea of setting up some kind of SaaS product, something that I could build and then turn it over to the public and they would be able to purchase it from me on a monthly basis. I think that when people do this with WordPress it's called WaaS. Is that right? Well, one of the things that I've always wanted to do was to set up a system where clients could sign up to a monthly / annual website plan, pick a theme that they liked, pay and it would all be automated - done for them (and me) as if by magic. Arindo Duque has built such a thing and, honestly, it's a little gem that you ought to explore if this idea has ever tempted you too.