BTW, is the GLBSE platform designed to scale?
A few changes in the backend (the database) need to be made, but apart from that it should easily scale. It's designed as a finite state machine for most parts of the system except the actual order matching, so scaling is really just a case of adding more machines.
I'm planning on making the needed changes to have it run on Heroku, in which case scalability is only a matter of cost then.
Nefario.