They want Street View to be constantly up-to-date, and they don't want to pay hundreds of drivers to constantly crawl the streets of the world 24/7. I can think of many possibilities when every Street View picture of every sign and storefront is updated every morning.

They've already got a lock on online advertising. Now what happens when all you need to do to use Google to advertise your business is to hang a sign in the store window and wait for the automated Google Car to come by every morning to take a picture of it?