Ok, on a more serious note, I think there is a definite market for this. Particularly boomers who are downsizing their houses for retirement (ok, maybe this was more likely before the housing market tanked). Empty-nesters with big houses tend to have a lot of accumulated junk in their garages, storage units, etc. The biggest problem is that they might not be emotionally ready to sell it -- which is the twist Jacob added about basically combining the services of a storage unit and a consignment shop.
Case study: In 2006, my parents sold their 5-bedroom house (my childhood home) and moved into a 2-bedroom. They junked a LOT of stuff in various storage rooms, but also stuck a lot in the basement of the 2-bedroom AND put more stuff into a few storage units. In 2009, they moved into an even smaller condo, and have been trying to figure out how to get rid of even more stuff in the basements, etc. Of course, they could have just gotten rid of it all in one go, but it took a few passes of "do I really want this?" each time giving up slightly more posessions.
If they could have just moved it all into storage, and then gave a sell-order after 6 months, they would have been much happier. I think 6-months might be too short, though.