The FSF are even stronger than the OSI on the point that people must also have the freedom to charge for the software if they want:

  Many people believe that the spirit of the GNU Project 
  is that you should not charge money for distributing 
  copies of software, or that you should charge as little 
  as possible — just enough to cover the cost. This is a
  misunderstanding. Actually, we encourage people who
  redistribute free software to charge as much as they 
  wish or can.

-- http://www.gnu.org/philosophy/selling.html