No, but I do have a valid reason. I've used computers for over 15 years, and I'm a big nerd and technofile.
Lately though, I've realized just how much the internet has taken over my life, and affected me in many negative ways. This includes socially; my generation doesn't know how to interact with each other anymore, mentally; it's difficult to remember anything when information is there at the push of a button, and in other aspects of life.
I honestly don't think the constant influx of information is a good thing, and it's certainly been an addiction in my life. Just try going without the internet for a couple weeks and you'll see what I mean.
For this reason, I'm trying to use computers and the internet as a tool rather than a lifestyle, and connect with people on a more intimate basis. Sometimes this involves leaving my (dumb) phone at home entirely. So it's for this reason that I choose not to carry a miniature PC with me all the time, and experience life rather than creating endless diversions.