I have a single box for 'friends', if they can support it themselves they're welcome to use it, if it costs me too much time or if they do something commercial I ask them to take it to a party they pay for that.

Another thing I did was to set up a free hosting environment using 'drupal' in order to get them to be as self-supporting as possible.

I understand that you're in the business of building the sites themselves, maybe you could partner with a company that does hosting and get a referral fee ?