I agree with this.

I would rather see them for free on YouTube or something. It would help me and others decide if it was something we'd want to try out ourselves.

Without having attended one, and as someone who has been reading OB/LW ever since Eliezer started posting at OB, it seems like the largest benefit I would get out of such a thing is the social networking benefits. If I'm right, and if I'm typical, you wouldn't be removing motivation for most potential camp attendees because they wouldn't get the biggest benefit ...person-to-person networking and friendship-building.

I'd say it was likely that those, whose motivation to attend was removed by feeling like they'd already got everything out of the camps by watching the videos, would be more than counteracted by interest raised in the camps by the videos.

Unless the videos make the camp seem boring or not worthwhile, of course!