IME some types of basses are just harder to move. The sweet spot for boutiques is five strings... not fours. Sixes are tough, it took me a year to move my first year MTD 635 for what I wanted but I was in no rush. Fretlesses are tough too. Even my 77 Carl Thompson fretless four just broke even on what I had into it. Basses worth over $2k that aren't in high demand can sit unless the price is very attractive. That's how I pick up many of mine.