I've kept my seat on, which I've had since the stadium opened and I'm in the process of moving to Weymouth! I don't think I'll get up to many games 5/6 maybe however, its made realise how much I love our club.
I remember a few years back, a Newcastle fan enquired about the seat next to him, which was always empty, only to be told that it was sold. However, somebody occupied it on boxing day. He talked to the chap, and found that his missus had bought it for him, as a xmas present.