Sorry about coming back to this contentious topic. I just wanted to add one more thing that's kept bothering me about this "it's free, so put up and shut up" argument for a long time, but I could not find simple enough words to express what exactly it was that bothered me.

It is as simple as this. If you use that argument, you are essentially saying, "it's worth the money you paid for it".

If even the advocates of FOSS use that argument, they unwittingly hand ammunition to their opponents. And reinforce the notion among the common populace, already concerned about the lack of support, that FOSS is worthless.