You tube product placement

A variation on the digital product placement here http://inventme.blogspot.com/2006/02/real-time-product-placement.html. To help monetize youtube, this idea could be used to do real time product placement into youtube videos. Not just at the front like they do now, but within the video itself. This would be done semi realtime and different people might see different product placements. This could be enhanced if all the info that google has on you is used to fine tune the product placement.