Google and Monopoly Money

It's widely accepted that a good strategy in Monopoly is to buy just about everything you land on. 

So, here's a thought question for you...   Given where Google's share price and multiple is right now, why wouldn't they do pretty much the same thing, particularly with revenue generating businesses? 

Just about any profits they could buy that are trading cheaper than their own stock would be, even growth stocks.

So where's the natural limit to this idea?  Surely they can't integrate everything all at once, but when you've got this much house money to play with, is there a really good reason not to go all out on an acquisition strategy.  YouTube should be just the beginning.