I'm not sure why I'd pay another service for this. What would the added value be?
If you're going for bigger group (which will mean larger deploys with far larger payments), make sure you're bonded, can prove security, that you're not running virtualization on top of our systems, etc etc etc. Your primary benefit as I see it is currently convenience, but trust is just as valuable.
This is what I'd be concerned about. I imagine there is a very small market in between the types of server users that have no idea what a kernel is and that it is configurable and the types of users in the 'enterprise' that either already have these automation scripts built themselves, or have strict enough security practices that prevents them from going outside their department for this.
That's cool. A lot of devs is not very good at sys admin stuff. I've actually had my puppet config and other sysadmin set up by a contractor.