The other comments are really spot on (Yc as a VC incubator and cost being almost neagative except for the opportunity cost that get it back to zero), But the

The other comments are really spot on (Yc as a VC incubator and cost being almost neagative except for the opportunity cost that get it back to zero), But the most often overlooked point is the fact that, thanks to the "almighty facebook", an previously unbelievable share of the world population is now trained and ready to use interface tools that belonged until know the geek realm. The barrier to user adoption for software as been reduced to zero: anyone is ready to use software as long as it feels a need.