You left out too much information.
No offense, but I see so many people say they are getting good traffic, but many times it's not much. Also, where is the traffic coming from? How much is SE? Where is the rest coming from? Traffic quality can vary greatly.
Most important, how many surfers are getting to your sponsors? How many to one given site? You could send a bunch to a mega sponsor that ends up a little per individual site.
Maybe your sponsors suck? I have some of those.
Gotta give more info..
One thing I noticed on the first blog, you don't push them hard to the sponsor. Your using sponsor provided youtube type embedded clips, with the sponsors url always on the clip. The surfer could just go up top, type in the url and bypass you. The sponsor url on the video is also much bigger than the text link you put for the sponsor. Just a thought.
One of your ads is in german? The Anna one on the sidebar. If your targeting americans, how many will know what that is?