the Rubicon Project - Aggreagted ads with a difference?

I am playing with the Rubicon Project at the moment. A form of aggregation with ad groups from different advertising channels.
So far it is interesting to see what it produces. Mostly I have been getting Google ads but from time to time an image ad will show. The last one was an Eminem ad...not quite what this site is about so not sure how they profile ads but...we will see.

You can see what is served in the block in the far right column at the bottom.