"It's important that Apple not be the developer for the world. We can't take all of our energy, and all of our care, and finish the painting and have someone else put their name on it." - Tim Cook, Apple CEO
The same statement rings true for Google. If others are reaping the rewards, and little to nothing is left for oneself, then what's the point? If a product does not meet the expectations set before it, then developing for it doesn't make much sense. If any given product is not self-sustainable, then it is not cost effective and eventually becomes a burden to the maker--even if users appear to enjoy using it. Make no mistake about it, Google is in the business of making money, and everything else is secondary (including good will.)
Google's co-founder and now recently-minted CEO, Larry Page, bought Android in 2005. He also brought along Andy Rubin, one of its creators, over to Google, who recently renounced his post as Senior Vice President of mobile Digital Content. Basically, the guy who was leading Android. It has been said that Sergey Brin, the other tandem co-founder, was not enthusiastic about the purchase. Former Google CEO at the time, Eric Schmidt, now Chairman at Google had a similar reaction. These somewhat pessimistic receptions were also shared by Vic Gundotra, Senior Vice President of Engineering. However, he recanted these thoughts at Google I/O 2010.