As much as I would like to say that I support free software for  "community benefit" reasons, I know that my reasons are more in the "personal freedom" sense.
This is probably because I don't contribute too much to free software development - I tend to just use it (and occasionally fix issues). I would like to be egalitarian in my reasons, but I can't claim that that is the case.
Hopefully my point here is discernable - I know that I didn't make it very clearly.