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It's not any different than marketing any other product service...supply and demand. I feel you are right in one regard, where Google is looking for market share.
As the number of cloud storage competitors increases, the prices will drop. However, at some point in the near-future, just like everything, the low-quality service providers will get weeded out, hence, a rise in price will occur.
How I look at Cloud-based services...is it needed, really needed?