Many wow gold people aren't glyphed up yet.
And although their effect is often just cosmetic (polymorph penguin for example), some people are still willing to pay for that. So it comes that minor glyphs sell for considerably more than major glyphs. I check the AH every day for all minor glyphs that I can make, and then only produce those where the current market price is over 20 world of warcraft gold, which is my standard sales price. As even with high herb prices I can make that glyph for about 10 wow gold, I'm making money. Plus often I don't pay that 10 gold, but gather the herbs myself, so I only incur an opportunity cost.With major glyphs starting to creep up in value, things like the Glyph of Consecrate and Glyph of Icy Veins are both holding at 30g - way above their production cost - and both are major glyphs. I'm wow power leveling the skill later than most, and stretching it out because I don't want to pat ridiculous herb fees.... the upshot is that its been paying off with increased prices on the majors I have to make to skill-up.I don't see glyphs holding much value long-term. For the most part, once you've got a couple of glyphs, you'll only change them if you change spec, or discover a dramatic improvement in strategy you could use new glyphs come on the market.Right now, prices are high because people are experimenting and many wow gold people aren't glyphed up yet, but I could see the prices dropping to close to zero for most glyphs later on.