How Can Google Support All That Free Stuff?

Answer: to protect their bread-&-butter: search.

http://techcrunch.com/2011/03/25/search-googles-castle-moat/

http://abovethecrowd.com/2009/10/29/google-redefines-disruption-the-%E2%80%9Cless-than-free%E2%80%9D-business-model/