The cost of building the first version of FB has dropped 90% The cost of building the next FB stays the same

More sophisticated tools mean more refined products.

If an easier and cheaper method for working carbon fiber becomes broadly available, it won't mean you get less money; it means you'll now be cramming carbon fiber in the silverware, in the shoes, in baby strollers, EVERYWHERE. The cost of a carbon fiber bike will drop 90%, but teams will be doing a LOT more.

You could say the cost per line of code has dropped 90%, but the number of lines of code written will 100x.