A good general rule is to sell the sets that aren't appreciating rather than focusing on taking profits. This does not apply to QFLL situations, of course (better to have sold RI for $100 than hold 'till now and sell at $20), but HH is firmly retired and I think we've got a pretty good feel for the available inventory. It is also, as Jaisonline writes, a unique set that is not likely to be reproduced, well, ever. The new Monster CMF figures can only help. They let people flesh out their Halloween style lego displays with additional creeps, and CMF list price is so high now that even near duplicates don't really compete much with the HH crew. As an aside, Chinese culture very much frowns on depictions of graveyards, ghouls, and the undead in general. This may have the happy side effect of dissuading Chinese counterfeiting of 'monster' lego sets and figures (for what it's worth, I have not seen any for sale thus far).