Requesting an entirely new file for CSS and Javascript is probably significantly more expensive (time-wise if not bandwidth-wise) than sending down more bytes for this one page.
For one time, the first. After that it would come from the browser cache with a bandwidth cost of zero. If every user makes a few queries daily the savings would surely be bigger than not closing a few tags here and there. And I still see lots of onclicks, and spans with multiple CSS class names. Their layout is not that complicated, surely there's room to optimize that too.
