Users don’t usually realize the value of free software they get for free. Things like Linux, LibreOffice, Inkscape, GIMP and a lot of other free software may be essential in the daily life of each of us. However, we may not actually feel “pleasure” for those software developers who provided us with all of this. They may not feel the value of what they have.
If you ask an engineer, a doctor, a professor, a teacher or a farmer to give you one of the products they do for free, probably they will just refuse. You won’t find a professor working full time in a university for free. You won’t find a civil engineer working on building houses for free. You won’t find a farmer giving you vegetables for free. However, you do find software developers giving it for you for free.