Exactly, I am sure a large number of the YC guys use free software on their servers and workstations, yet how many have given monetary support to the FSF in the form of donations or anything ? I won't be surprised to know the answer will be too few.
Anyway, just give the man some respect, he is somewhat an extremist, but if it weren't for this guy you wouldn't be starting all these startups on shoestring budgets and I know that everyone in their heart of hearts knows that the world is a better place because of RMS.