Okay, put another way: If *I* don't like how a bass plays, I'm not going to want to buy it. True, many basses are just set up poorly (or strangely - depending on the player) but many are just bad players. Who wants a bad player?
Its not even about the setup. it can be the basic design itself. Some people just hate thin Soundgear necks and narrow string spacing. Some people just hate Warwick necks and weight. Some hate the neck and balance of Alembic Series I. Of course there are many more examples.