I personaly only know of one other collector who collects singles exsclusivly. I pick up singles when I can not get a pair as I would rather have 1 than none. A few collectors want all the full sticks they can get, when I get a stick of dice I do not already have Ii pull out a pair and trade off the others, especialy if they are rare. You also need to remember the value of a piar or single will vary greatly with who wants it and just how bad they want it (as with any collectible)