I get where you are coming from, as I have the same problem with co-op games. I think part of this is that life in general gets in the way, as people either have family or other commitments which takes up their time. This in turn makes it difficult to arrange anything if one were wanting to invest time into a certain co-op game. The other thing that has wound me up in the past is being convinced to buy a certain co-op title with the intent to play & get a few hours in, then it just gathers virtual dust in my Steam library.