Just from examining a match factory
But there are also the priests and doctors, from whom we reasonably do not expect to hear "this is all about my interest, what's in it for me?" And likewise there are many enterprises where people are doing them for reasons which do not relate to turning a profit, a category which a great deal of valuable open source development falls into.
Adam Smith wasn't a free market fundamentalist in this respect, much as the fundies would like to make out. He was very much in favour of regulation.
I like this:
"..The proposal of any new law or regulation of commerce which comes from this order [businessmen and traders], ought always to be listened to with great precaution, and ought never be adopted till after having been long and carefully examined, not only with the most scrupulous, but with the most suspicious attention."
SOPA and ACTA anyone?