If you want to make your clients not worry, take over the entire process of being on the internet, not just hosting (there's a lot of worry in getting a website made). Get a network of freelancers and farm out the actual work, but you're the face of the work that the clients always talk to.

But there's a pitfall here: While you can make money on developing website, it's very hard to make money from value-added hosting. If you charge maybe $25/month, you can afford maybe 15 minutes of support a month, and you still face the risk of the client moving to some crappy host that only charges $5/month (80% savings!!) and they won't know what they're missing (you) until it's too late.

Either way, you're going to end up in the people business, not the hosting business -- and is that what you want?