A long time ago, I read in Guitar Player about some bluesman who liked to buy a new guitar every few years. He said it was because they ran out of music. He had a quote like, "Guitars run out of music and you gotta get another one." I subscribe to this theory. It remains to be seen whether or not my beloved 98 Jazz will run out of music, but I've experienced this with every single instrument I owned previously. I have a guitar I feel that way about now, but I play so few guitar gigs that I can't justify owning another one so I'll have to limp along with an empty guitar...good thing I'm not that strong a player or I'd be screwed. Sometimes you can leave an instrument alone for a year or two and music will magically put itself back into it, but it's a lot like a cordless phone battery...after a while it doesn't hold the charge like it used to. However, some instruments can be recharged to full capacity by another person. I've bought used instruments that had plenty of juice in my hands but none in the seller's. I've seen it happen with other people, too. Everyone in my last band ended up buying new instruments over the course of our time together because their old ones ran out of music. When they got the new ones, they played much better and had more energy in their playing. It's because the new instruments had so much music in them that they were compelled to play them at home. Now don't get me wrong. I'm not talking GAS here. GAS is a psychological disease. I'm talking about using an instrument so long where you just can't seem to wrestle another note of good music out of it. GAS is just buying a new instrument because you're bored and have too much disposable income. So the next time the wife complains about you wanting to buy a new bass, tell her the old one ran out of music. She won't understand GAS, but she'll understand science.