Today, my seven day audit says 105k incoming, 30k outgoing gold on my inscription char, 75k profit this week. And I'm stockpiling inks, so that 30k it's more that I needed to craft. I would be honest saying that it has been a better week than most to me, but all that comes from glyphs, so I don't know why non-scribes think there is no money to be made, because "you only buy a glyph once".
The inscription market it's smaller than gems or enchants, but that doesn't mean there is less benefit. Just that you need to have less people selling. Considering that new scribes can't really enter the market (due to glyphs books), it's not that hard to profit if you happen to be in a server without someone specially annoying, that let 2-3 people do a fair profit. Or if you are that person on your server.
Btw, there has been a ban wave of bots or something? The last 2 days there are far less herbs on the AH and the prices are going up. I had almost finished stockpiling, but... yet I wanted a bit more. Don't know if someone else has decided to stockpile heavily, and is buying at every hour of the clock, though.