AK is the new Sastasha in this expert roulette set the one that nobody really enjoys as much as the other two. I think what happens is that the duty servers only have so many slots for runs at one time and because it's the least popular one that people won't choose to run as much as the other two outside of roulette then there are a lot more slots open for AK increasing the chance of getting it when you queue for all three at once. The DF first tries to fill a party then it reserves an instance so it'll only put you in an available slot. This is why sometimes a full party in the queue for one thing can actually have to wait a while for others to finish and free up slots.

The statement that it's hard is kind of funny. AKHM isn't difficult at all same with Sastasha HM it's just really boring.