They are very very hard to get (since they introduced them I farmed 24/7 nonstop and today got one) and above all that when you identified them you get low-grade ones.

 

I know you want people to buy them from the shop but at this rate, it's very unfair for the F2P people who can't afford to spend money on games.

 

They are very rare. But, 90% of my farming is BS mode, and i got 2 by now. 1epic, and 1 unique. But it should be better drop rate, you need 4 - 6 for your main and few times that for your alts.

Check the market. You can get a glyph without spending $.