A lot of clients are actually willing to pay for you to host their site, just as long as they don't have to do anything technical. We're talking £350 for a year in a lot of cases and the site could simply be an addon domain on a package with a few sites on it. This also includes a walk through of setting up emails on Outlook, iPhone or what have you.

They just don't care because you end up doing something that takes you 5 minutes and little to no energy which would be next to impossible for them.

Since the margins are so high, you also have freedom to make nice discounts without a loss.