Trouble with YouTube is it's clogged up with so much rubbish, your uncle dancing at some unknown bar for example which has near-zero advertising potential. As a result, the company (owned by Google!) loses a shade under HALF A BILLION USD every year - turning over only around $240 million in advertising revenue. The result is deliberately low server load - and besides, splitting up videos into 10 minute blogs allows for more ad impressions right?
VIMEO is brilliant. I follow SEOmoz regularly and they switched to VIMEO - high quality video which also forces embedders to add text links to the bottom of the video. I embed some of their material on my sight and love the clarity it gives compared to YouTube; take a look at the sample on this page:
http://www.how-to-build-a-website.co...echniques.html and notice the text links.
YouTube can be a massive traffic generator though; it is the world's second largest search engine behind the mighty Google and users (on average) surf for 27 minutes per day; take a look at this site:
http://www.webvideofordummies.com/