Why OpenSource???

not much to write this time. just wanted to assert the fact that im a big fan of openSource. but why?? the anti-microsoft logic?? the monetary advantage?? well, yes and no.
yes bcoZ they do form part of the reasoning, and no biggest there is another single largest factor that outwits all of these.
and that is bcoZ open source works on a simple law known as the Nash equilibrium. and that i shall quote in simple words here

the maximum benefit to a group can be realized if each individual works for his own benefit and the group's