My turnoffs?
- Relics. I mostly buy used basses, but I want them in good condition. I can deal with moderate, honest wear if I really want the bass, but I just don't get relic'ing. That's not a criticism of the aesthetic or of itsfans. It's just my personal taste.
- Less traditional body shapes. The one exception is a Bongo, and even then I only want a very specific Bongo that I've only ever seen one of. Other than that, I prefer traditional shapes.
- Crazy colors and finishes. I certainly appreciate a nice metal flake and some sparkles, but they're not the kind of thing I'd buy for myself. I have five basses and all are some kind of traditional looking bursts. Again, just my personal preference.
- Excessive weight. I own a Stingray (and am picking up second Stingray this weekend!) and an L-2500. They're heavy enough and I regularly play 4-hour, 4-set gigs with them. But there's no virtue in heavy for heavy's sake so lighter is better.
- Corollary to the above item - the insecure jack wagons who have to chime in with "Man up and go to the gym!" to prove to others that they're real men anytime the topic of weight comes up. No one other than you is impressed by your display of he-manliness.

- Poor balance or excessive neck dive.
- Useless knob/control names. I prefer names that tell me what the control does as clearly as possible.
- Poor handle placement on cabinets.
- Fretless basses. However, that's because of my inability to play them, not because I dislike the concept or the sound a good player gets out of them. Wish I had the time to put into getting better at it, but for now, I'm sticking with fretted.