Hey there! Glad to see your site is doing pretty well, congratulations. And thanks for mentioning Ministry of Tech in this post, I appreciate it! Keep on bloggin'
The thing is, Myspace may reign over the Myspace kingdom, but not over the rest of the web. Very rarely does someone post a 'Myspace Video' on a 'non-Myspace' page.
Also we have to look at the overall quality of the video submissions, NOT the quantity of videos on each network. I think YouTube's quality factor is what will let them retain a nice chunk of the Myspace territory.