That explanation simply doesn't go far enough.
Most sensible people won't spend money on things for which there are cheaper alternatives. Most FReepers, for instance, would not spend money on purchasing a calculator if a cheaper alternative (like pencil and paper) would completely satisfy their needs.
Regards,
They take to a farther extent than most Freepers, but that is the essence of their position as I understand it. Somebody else pointed out that they are somewhat communal as well, not wanting anybody falling too far behind or get too far ahead of other members lest it weakens the community ties.