Not always true. Right now everyone is leveling. In a month or 2, they will get bored. I keep 2 of every enchant scroll on ah, even the ones "no one" wants. I buy all my mats aside from the few I get in groups, all auctions are priced 20% over material cost. Many of them I am undercut on, and that's fine, I got stamina. Eventually I get to the top of the list, selling about 20 scrolls a day. Many of them the under appreciated scrolls that don't gay the glory.
I also make money buying in bulk. I see dust selling at 50%, I buy lots.