Lets say you're listing eight of every glyph, and consistently sell that many every day without fail at 150g each.
Sometimes someone undercuts you, and you undercut back or match them.
Irregardless you average 8 sales of every glyph close to 150g each.

Then over the course of a couple of weeks...
Three or four players compete with each other over price.
Each is listing 10 of the glyphs.
And then cancels auction and relists.
They undercut each other (you initially) by 20g a sale.

By the end of two weeks...
There are 50-60 of every glyph on the AH... sold by 10 or 15 different sellers.
And now the going price is 40g.
When if they had all undercut you by 1 copper at a time, the going price might be 144g.

Everyone is making 100g per sale less than they could.
And you're not sure you want to spend 25k buying lots of your formerly most profitable glyph.

The analogy is not perfect, as you probably list 400 types of glyphs.
Rather than one or two products.
Let's say for argument, each glyph sold for 150g and now each glyph is 50g or so.

Would you call the people who drove the market down to 33% of its value in 2 weeks, and have it flooded/killed idiots?
I would.




I think I'll just do the Volatile Air.
That's a safe 40k a week profit.

Truegold was 75k but is barely 50k a week profit now.
And falling still.