It might be partially mental and partially laziness... There are 2 types in my opinion. Those people who keep a bunch of stuff because they know it still works even if THEY don't need them or make use of them, but keep them just because they might still be useful sometime in the future.
Then there are those who don't even throw out the bathroom trash and leave it piling up, or any other trash at all for that matter. It's disgusting.
However, being lazy has to do with your mentality as well. They "think" it's too hard to do one thing or another, and end up doing nothing! Whereas some people have trouble figuring out if they will make use of something later on, if it still works.
This link is by far the worst thing I've ever seen! EWK!
That lady is one disgusting person, along with her children! All of them are lazy sick humans! Yet, they all blame each-other. Crazies!