1. It would be cool to have Arcane pet droppable, and yes I realize it's not gonna happen.
2. Not all of us have passion in gambling, and currently you 'push' people to gamble to obtain HammerJaw, mostly cause of the achievement it provides.
3. In lottery you know that your chances are ~ 1/1000.000 and don't feel yourself deceived, there is no lose in a lottery, and if you win.. It's a fancy car, or apartment, smth that is worthy to try from time to time, it can change your life. And yet again, you know it's a lottery. In this case most of us haven't expected it to be so, thus we rush and open those crate chests. If you would introduce it like a lottery, like 1 in a million, there would be no complain in the first place and people would still buy.
As a game creators, you sell not some pet, but happiness, joy to play. And here.. (*Munchin drama-cookie*)

So here is my suggestion
give us fixed plat arcane pet - 500plat for KillerWhale for example, and let this HammerJaw be lottery/gambling.

I would like to hear more suggestions to this case, and support