I don't know if it is something similar to this, but the last few years, I'm experiencing the "I want something else" problem. This is since I have a larg(ish) gaming library (GOG.com sales) and e-book library (Kobo Coupons). It doesn't matter what game I'm playing, or what book I'm reading, I often feel as if I want to play or read "something else." In the past, this was not the case, because my TBRead or TBPlayed 'pile' was only one book or game high. Now I have 800 TBR books, and 20 or so TBP/R (to be played/replayed) games.
Therefore I come to the conclusion that having a large choice of books or games at your immediate disposal is not good for your (my) concetration. It creates the feeling of having a lot to do.
Sometimes I wish I hadn't built up my e-book library to include a thousand+ books (and 60 huge Delphi Classics), but then I remember that these e-books are MUCH more future proof than games. I'm sure there will be EPUB2 readers LONG into the future, or else, a way to convert into a newer/other format. Games can fail anytime a new operating system (or even, an update to an existing one) is released.