There can be non-easy ways that can be accomlished though:
50 Emblems of Frost per [Scroll of Deception] OR 1000 [Arena Points];
25 Emblems of Frost per [Scroll of Purification];
At most via the EoF method, a player will be able to obtain 1 per week if they do they raid quest, 10, 25ICC and a daily HC. With the way [Scrolls of Deception] are right now, the chance of getting one is so outstandingly low, that it is more of a background thought, rather than a foreground one, for most players. As in - I have 3 scrolls of deception and want to transmog my holy pve, holy pvp, ret pve and ret pvp gear that is to require a lot more than that. I COULD theoretically buy some odd 30 from the marketplace OR buy 2 Shadowmournes OR buy nothing at all and keep transmog opted-out from the website because I am bored of my current t-mog appearance. If I, and I imagine a lot of other players, had a way to grind towards my 29th scroll and needed 3 more after that, the likelihood of bulk-buying them would be a lot higher. Or in other words, they are extremely rare & expensive for MOST people to be arsed to buy them.
This will also help reduce the [Primordial Saronite] inflation and give end-game players something to spend their non-utilazable resources on, other than primos or honor, which they use to buy cardinals.