Comment by Jenda_

This seems to be a cool service, I was actually thinking of creating something similar (but was deterred by the hassle of setting up billing and user management apart from the interesting technical stuff). I sometimes get asked by someone not owning a server/account they can use for ssh -R 0.0.0.0:1234:localhost:22, who are behind NAT and need to publish some service on the internet.

Why is the traffic rather limited? You seem to be hosting it on Linode and they offer like $5/TB traffic, I think you could easily offer several times more traffic, at least with the bigger plans.