In the thread, the original poster suggested that the cooldowns of certain novelty items were too long in comparison to others and that Blizzard should consider fixing the discrepancies. The poster used Pendant of the Scarab Storm and Bones of Transformation as an example, noting that both items have a vanity effect that lasts 20 seconds but a cooldown difference of 90 minutes.
Lylirra responded, explaining that the cooldowns, though seemingly random, were chosen with specific issues in mind. She explains that with the Pendant of the Scarab Storm specifically, developers were concerned that the item's effect might strain certain players' computers.
Personally, a little lore logic behind the items might be nice as well. How is it that my character can summon a god every 3 minutes, but it takes 10 minutes to round up some sassy dwarven ladies?