Digital BW, The Print

I'd like to know if serious silver printers print ALL of their entire 
edition at one time, in one run? 

I'm not talking about art fair guys; I'm talking about guys who are 
represented by galleries, who are selling prints for a grand and 
higher.

I know one guy that I can call today. I'll report back.

I just want to know if silver guys are printing "on demand", ie 
when they get an order, they make a print. If so, how could all of 
the prints in a given edition ever match? I'd think it would be quite 
impossible.

MT, http://marktucker.com/