We buy and sell lots of guitars here. I sell very few guitars, since I tend to get pretty attached to them, but I have recently sold some to fund some purchases, guitar and otherwise.
Most recently, I sold my Ibanex RG4EX1 so that my wife and I could buy tickets to see the Beatles Love Cirque du Soleil show. Hope it's worth it! But really, I love those Cirque shows, and I love The Beatles. I've wanted to see the show ever since it came out, and since I'm certain that I don't like double-locking whammy guitars (I've had two, and both have been sold), I know I'll get more out of the experience of the show than the occassional chugga-chugga-dive bomb-wheedly-wheedly-wooo I got out of the guitar.
Anyway, what are some reasons you've sold gear?