This article missed a key strategy, which is to know how to avoid provoking other sellers into cracking, and building a wall at all.

My server has a tenuous relationship between the most active of sellers. Most seem to know when to back down, and just log off. The most experienced glyph sellers are filthy rich already. If you're in the mood to camp the AH, do it for one or two days in a row maximum. But then, relist with longer gaps in between each cycle. If you let your competitors make a bit of profit, everyone ends up with some tidy profits, and the chance for a wall is less. Note that the wall is most often built from SPITE. Don't be so greedy that others feel you are being a jerk. The wall is less likely to appear, and everyone will sell their glyphs at higher prices for a large portion of the popular glyphs.

Even though you think you should be able to buy a 25000g Blood Queen's Crimson Choker at the drop of a hat-- you don't. Try to recall that being worth over 25000g on a server puts you ahead of the VAST majority of players. Give competitors a day in the sun every week, and everyone gets rich.