If I had to speculate, I would say it goes a little bit like this.
Google knows they can't compete with Apple's high level of quality so they aren't, instead they are trying to flood the market with android phone. The more android phones, the more people forced into using the android market. The more people in the android market the more devs will be forced to support it just because the ability for profit is there.
It's a numbers game really, google hopes that they can basically pull a MS Xbox and muscle their way into the market.
They hope they can muscle their way in? It's a little too late for hope, isn't it? Looks like they have knocked down the door and sat down at the table.
What quality are you referring to? The quality of the Android OS, or the quality of the hardware (which has nothing to do with Google)?