It will be better if you remove or reduce the coins of Scroll of Illusion. 50 coins are alot for this I was gathering for my favourite weapons and I can't get it now thats alot for me 132 coins for transmog on glaives. I suggest you to change Scroll with Illusion with the normal scroll from BG's, raids etc.
It's a legendary weapon. If it was any lower half the people would run around with legendaries.
50 coins reflects its status of a legendary weapon.
Besides, something has to pay for the servers..