I'm Just Asking

Why don't blogs ever include a 'back to top' link at the bottom of the page? I'm talking about the long-list type of blogs, like Kottke and Swiss Miss and Daily Kos and basically every single other blog. When I get to the bottom of the page, all that carefully thought-out navigation (aka usability tools, ahem) are long gone.

Likewise, when you choose to read an entry's comments, you get to the bottom of another long page and there's really nowhere to go. Some, like Jason give you a lot of other stuff at the bottom (I think this was Hemingway's 'innovation' that caught on with self-designed blog templates), but no global nav.

Am I missing something? Is there something fundamentally uncool about the back to top?