I have figured out the upgrade itch

I think I have finally figured the upgrade itch out. I answered another thread that wanted to know (what do you do while listening to music?) I said that 25% is serious listening and the other 75% is half heartedly listening and reading. I went on to say that it use to be the exact opposite of 75% critical listening and only 25% reading. I have not upgraded anything lately but I have the itch to do so. I've noticed that when I upgrade anything in my system I tend to do a lot of critical listening. I believe we upgrade so frequently so that we can enjoy serious listening. To me critical listening isn't fun unless a new toy is in the sand box. What do you think?