Google is paying big money to take the market by storm and they need to do it, because when they entered a field that was already being dominated by Apple. Congratulations for Google, it turns out their engineers are good and their pockets deep.
However, how long will these deals last. Let's just assume that in two years time Android reached its goals (just a random timeframe). What will happen at that point?
a) Google continues paying, sharply reducing their profits, especially compared to those of Apple.
b) Google ends these deals, increasing its profit. However, they risk losing the sharp market share growth, potentially even seeing a decline as carriers and manufacturers will get their profit elsewhere, raising prices for the consumer.
So I can't really imagine this to be a way of gaining market share that's built to last...