I would turn this around. As a guy who was doing OSS here and there (and still got burned out by doing only a little) I completely sympathize that nobody should ever expect people to do important work for free. Absolutely.

At the same time, it's a good response when somebody muses in a saddened manner "I wish my favourite language was more popular". Then I can spring out of the bush and tell them why it isn't. This doesn't mean I expect the OSS community around the language to serve me -- of course not! But it's a good explanation on why language X isn't more commercially popular.