'Lord Sargeras, sweep your molten fist through this world, so that it may be reborn in flames and darkness!'
'So the light's vaunted justice has finally arrived.'
'Boldly said. But I remain...unconvinced.' My Warrior
My only guess is, they don't want people spamming them and annoying other players. I know most of them are harmless, but something like the toy train set needs that 30 minute cooldown due to the annoyance factor.