I have 3 max level characters I've done the Halloween Event every day with for two years. I only saw the HH mount twice, on the same character, back to back days. So let's say 2 drops / 14day x 3 characters x 2 years
I've done it since the very first year when the mount was available but nothing... None of my characters have the mount. Hell last year it dropped like candy, everyone around me got atleast one but here i am another year another without any mount drops
Did it on my mage alt ONCE for the achievement last year, bam pet,mount,sword and a mask. I didn't even level him to 85. Got it on my tauren druid aswell while going for the ring and the pet. It really pissed me off. >.< I guess I shouldn't complain since i got it on alts atleast but... If only tauren didn't look so ridiculous on a horse.
Did HH every single day on 4 chars and a week straight on a fifth. zero mounts.... this after trying for 4 years. Oh yeah, 2 helms on my druid and one on lock. None on my dk which i want it on and ofc the gms can't transfer, not that i believed they could but it was worth a shot.
This year i did HH every day with 3 characters, i got the mount on my alt dk but not on my main.
Luckily i also got HH helm for my dk, so it went good but it could have been a lot better if i had the mount on all 3 characters.