I had this idea for dirt-cheap colo where it's just a warehouse that has warehouse racks for putting whatever you want on the rack. Rates based on linear feet, bandwidth, and power consumption. Power would be delivered with a 15-minute uptime guarantee, meaning you have at least 15 minutes to gracefully shut down in the event of loss of power.

Advantage is reasonably secure location and quality Internet connection. Target market is nerds who don't want all that crap in their closets.