[bbunix]

I wrote Big Brother (http://bb4.com), and it was 99.5% free (until we sold out to Quest/Dell). Originally a lot of our revenue came from support.

We just offered 3 tiers of support. For $250 a year we'd answer emails. For $500 we promised an answer within a day. For $750, within 4 hours, and for $1000 a month I'd take your phone call.

So, people are paying for your time, and for access... I was shocked my how many people opted for $1000 a month phone support (direct access to the developer/author).

Otherwise, support continues to be provided by a mailing list, group or other mechanism.

Good luck!