My 'office' space is actually a corner in the lab. There are two grad students who sit right behind me*. Undergrads abound. I really hate sitting anywhere with my back exposed. At restaurants, Grackle is kind enough to always take the aisle seat. Nothing gives me comfort like a corner booth. Additionally, it is never good to have your computer facing the masses. There was a grad student at my last institution whose desk faced a wall near their office door. That student played a lot of online games and everyone that walked by saw it. People don't take them too seriously. So having a computer that faces your entire lab would make it difficult to check your facebook, or your twitter, or cuteoverload and especially your pseudonymous blog. This is my current situation. I'm calling about getting internet installed at home today.
*They are both at class right now.