do you know how people earn through open source ventures? When free and open source projects help many in great ways, still I think that the people who get involved in it full time (not volunteers) should finance them selves to keep the project going.
I am asking this question primarily as I didn't have a good explanation to one of my friends who asked me the same thing; he was going to build a GIS system and was planning to move it forward as an open source venture. At the same time he was looking to generate revenue from the project to fund the development costs. According to him his primary intention was to make money out of the project in the long run, and I was clueless about the viability of such an effort.