Have you ever been a one man Geek Squad? (Of course you have)
noodle: i've actually considered doing this.something to consider is nerds on site, which is basically an international group of contract workers doing what you're doing, but they provide a network of support for the process.something worth considering is providing the service of at least attempting to diagnose problems via VNC, instead of making house calls like geek squad does.  provides the one-on-one support by inspecting the computer, but doesn't incur the cost of making a house call.  it'll probably be easy to spin it as beneficial, since one wouldn't have to cough up a house call bill for a minor issue.