Well, it's kinda like how Bunny Heads / Santa Heads are being dropped every so often, the longer you play the more likely you'll be to get some of these items, and they'll only become rarer with time, as people lose them, get banned, leave etc
I heard that one haloween a few years back, they could be brought with some nether items. Apparently most donors couldnt afford it, because nether stuff was rarer then. I honestly do not know if this is true or not, but if someone did manage to buy one they would be so rich in todays skyblock
I'm pretty sure that didn't happen since the nether was enabled for a while after the server opened, allowing all users to get nether items even though the nether started lacking in the useful nether items like glowstone pretty fast.
I thought of that as well... I wish the person who posted that they brought one on a Halloween would post here.
What I want to know is, why have I heard about people selling these on ORG? There are no $400 donors here so I am a bit confused.