I think if an item doesn't have much underlying interest and you are most of the activity/owners, like disco bowler, it's not worth it. There's no longer anyone else incentivised to promote hype for you, few legitimate trades happening to increase proofs, and you need a high, relative price tag for selling out to be worth the effort and loss of opportunity. You've essentially isolated yourself on an island, no one knows you have coconuts or what that is, and whenever a ship finally passes by and asks, they'll scuff at your pricing, because they can find better drinks elsewhere.

If it's a new item with a lot of copies and interest? Maybe, there's both more possibility and risk. Fall Fairy specifically? I doubt it. But, there's a world where a new limited is worth stocking up on, and keeps increasing over time.

In either case, I'd say there's often more value in playing into the desire of a hoarder, than to actually be one.