I think they refer to most of us as being: Obsessive and compulsive.
We have a disease called "more".
A little bit of something good -- is never enough. And, sometimes, a little bit of good -- is too much.
We have difficulty with "just one" of anything.
When I buy screwdrivers -- I never buy just one. At the least, I'll buy two, so that I'll have the one, while I'm looking for the other one. And, when that idea sounds good to me... Well. I'll go ahead and buy the dozen pack.