Not having tools at hand is a major factor for not to pursue a project everywhere in the world. Not just in the open source world. I don't think Guido or Larry or Matz would have taken trouble to write a compiler to write Python or Perl or Ruby.
Not to mention nearly all major open source projects and many other closed projects are using gcc one way or the other. I bet even Apple uses gcc in some way.
Work happens by incrementally building on others work. Even Linus agrees RMS is one of the giants on whose shoulders he has stood to look farther.
RMS might have some problems communicating in most socially accepted ways. But he has achieved and helped other achieve far more things valuable. And he has done it in time. A lot of people have built on top of his work. And a lot of that work has made a lot of money and provided employment.
Its wrong to compare Steve Jobs and Richard Matthew Stallman. They are great in their own rights. But in terms of absolute comparisons, RMS has achieved far more than Jobs.
iProducts are the cool must have gadgets of this era, they haven't changed the world any more than video games have.