Need someone to install the ruddy thing?
There's decent money to be made in consulting with and for open source based solutions. Not quite as much gouging opportunity as "traditional" closed-source specialist "service delivery" by the big software consultancies, but then you don't need to be big to handle it either. All in all a nice field leveler and honest business enabler.
The downside, of course, is that the client must at least have some notion of what sort of question to ask, and what to do with the answers.