Now that Yahoo CEO Marissa Mayer has Tumblr in the bag for a cool $1.1 billion, AllThingsD reports that she may buy Hulu for between $600 million and $800 million. Considering that Hulu is reported to have brought in nearly $700 million last year (and has 4 million paying subscribers) and considering that Tumblr is said to have brought in an underwhelming $13 million in ad revenue, those numbers side by side are kind of wild, aren't they? Is Hulu really worth up to 45 percent less than Tumblr? Isn't online video the one digital area where traditional advertisers are truly warming up to? Is...