It used to mostly be playing, trading, collecting, teaching, and admiring guitar. And audio production. I owned a boutique guitar store (high-end, appointment only) on the side, and I still own a recording studio and mobile unit. I find that my formal business interests are now crowding everything else out because I simply enjoy it more. I was so into guitar (interest, time, and money-wise) for so long that I'm trying to force myself to give it a rest. [Well, to be fair, I also had some paralysis for a while that helped slow me down.] I haven't taught in a while, no longer play out, and the studio is professionally managed and run by others now...so it has become too difficult to justify to the wife why I need $750,000 worth of guitars to entertain myself. She thinks one guitar and one amp should suffice. Philistine! ;)