my impression is that the slower than desired growth is actually pretty expected for 10937. Superhero sets aren't what they used to be. 1) I think resellers caused the initial "pop" after retirement unlike a set such as Helm's Deep which had been pretty slow and steady since retirement. 2) It appears Superhero sets are mainly purchased for the minifigs and then only a lesser percentage of that group actually cares about the bricks enough to spend major $$$ (€€€, £££) on retired superhero sets. 3) We are no longer in the era of Batman 1 and it seems main driving factor are the minifigs for sets like AA. At the same time, there are just too many superhero sets to pick from. Buyers have too many choices (good for buyers, bad for resellers). When the 1st AA retired, you couldn't most of it's minifigs in other sets so that kept it's demand high. Now the 2nd AA retired, little tommy could get Batman, Robin, Penguin, Joker, Riddler, etc...in another retail sets for far cheaper prices. Now pretty much all of the 10937 minifigs have been refreshed again with yet other sets (mainly JokerLand & a couple of other sets). Acarecrow is the lone except as he' stinky been refreshed twice since 2006 (available in 3 diff since). This set never had time appreciate (like the original AA set) without minifig refreshes . Thus, the slowed growth was somewhat predictable and investors need to rethink whether to hold or fold. I think the set deserved at least another 6-12 months before folding but waiting too long could be risky for the reasons I mentioned above.