Although the idea may be an alien one for many denizens of BGG, wargamers are pretty familiar with the idea of having games you're pretty sure you won't play but still seem worth having. This is attributable to the fact that many wargamers aren't even primarily gamers, but rather people interested in history or military affairs. That's not to say that they don't want to play the game, when given the chance, because playing will bring out the full experience. But it does mean that playing is not the only, or even primary, reason for owning the game. What these games do have in common is deep research, often by subject matter experts, that can provide the kind of insight into a military event found in the best books. Usually the reason why they don't get played is the difficulty of finding someone else with the same level of passion for the particular topic. Any two gamers will probably be willing to play Lost Cities. Any two wargamers will probably be willing to play Hammer of the Scots. But to invest the time and effort needed to play This Hallowed Ground, for example, you need people are REALLY into the American Civil War, Nineteenth-century tactics and, probably, the Battle of Gettysburg. Most haven't been played enough to even get ranked on BGG.