Headless Horseman Mount

So I've been following the discussion on Sinister Calling and the Headless Horseman mount farming, and I really just don't get it. I've farmed HH for 3 straight days, with over 150 summons (80 on Sunday alone, 5-6 hours) and I have not yet once seen the mount. In fact, the only mount in my guild belongs to someone who got it on the 8th try on the first day, and no one else in the guild has seen it since. Is it still really in the game? 150 summons and no mount is ridiculous.

Along my incredibly boring and mundane farming trip, I've seen the Squashling about 15 times, often times popping up within 5 or 15 kills of eachother. I understand that the mount drop is 10x as rare as the squashling, but you'd think after 150 or so summons, you'd think we'd see at least one.

It seems to me that this mount is far more rare than even Ashes of Al'ar. 150 summons is akin to nearly 3 years of killing Kael, once per week, and never seeing the mount drop. Is it really meant to be this bad, or do I just have terrible luck?

Of course, I'm fully aware that this is a rare mount, far more rare than the joke that was Brewfest (we often saw back to back mounts, and sometimes both on the same kill), but 150 summons without one? This is not so much a complaint / rant, but more of a "does it even still exist?" type thing.

Thanks for any feedback in advance.