Glyphs have always been a very tough market to enter. There are so many different glyphs, made with so many different inks, milled from so many different herbs, that the profession basically requires addons if you want to turn a profit from it. This was especially true during Wrath of the Lich King when glyphs were consumable.

Back then, if you overwrote a glyph, that glyph was gone forever. It no longer existed for your character. The only way to get it back was to obtain a new glyph item and use it like you would a potion. As soon as you clicked on the glyph panel, the item disappeared from your inventory and activated the glyph. If you wanted to swap back and forth between two glyphs (or more), you needed to keep stacks of those glyph items in your bags.

This system ensured that every player would always need more glyphs, just like every player always needs more enchantments or more gems. The profession would never be "dead."

Scribes enjoyed it because it meant they sold a lot of glyphs. Because they were consumable, glyphs required only one ink to make. You could produce a large inventory and sell a large inventory, if you were savvy and patient enough to keep everything organized.

Most non-scribes, however, hated Wrath's glyph system. They ranked it somewhere between inconvenient and utterly obnoxious. They didn't want to carry around dozens of glyphs and constantly buy new ones. In particular, switching from a PvE glyph set to a PvP glyph set was very painful because the two sides of the game often required entirely different glyphs.

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