Here in /. we're not average computer users, so we have a hard time figuring out what average people expect from computers. There's an easy way to get around that, though: we're average users of many other products. The answer to your question becomes a lot more obvious when we apply it to other things:
Does the "average" user who picks up a washing machine expect it to be capable of more than what it does out of the box? Does the "average" user who picks up a frying pan expect it to be capable of more than what it does out of the box? Does the "average" user who picks up a screwdriver expect it to be capable of more than what it does out of the box?
The answer is a big "no". Now, people here will tell me that computers are way more flexible than washing machines, frying pans and screwdrivers. For a motivated tinkerer with proper mechanical and/or electrical abilities, though, washing machines, frying pans and screwdrivers may appear as full of interesting alternative uses as computers appear to us. So this is not the point, either.
Most people aren't looking for flexibility, and they'll happily will trade it for ease of use and convenience as soon as they can.