Indeed. This works very well. Also as a side note some people will be asking you to make the cards for them if they provide the mats. If you're milling herbs for them just ask to keep the Burning Embers that come along with it. These embers are pretty valuable but most non-inscriptionists can't do anything with them. The Embers can be turned into Inferno Ink, which in turn are the main mats of the 346 inscriptionist relics. Most likely these relics will sell on your server from anywhere from 1500-3000g. If you already have the embers from milling herbs for people it's just one more quick step to make an additional profit through the 346 items.
Hope that was clear enough. I'm pretty tired at the moment.