Also, I noticed I spent a lot of time maintaining the demo instances (resizing). In a real deployment the number of users per machine is pretty much static, but here I've had to deal with scaling and spikes.
It occurred to me today that I could probably put the free demos behind a load balancer (smaller basic machines, and scale them up or down), so that I don't have to manually resize the instance.
I've taken down the two demo sites (free & hk) for now, while I work on the load balancer setup. Should be back up in a couple hours.