A precision or jazz copy would take just as much work, if being hand made, as something in a different shape. With many high end jazz basses the body shape is really the only similarity, and even then, it’s often shaped quite differently if you were to compare to a Fender.
I’ll just add that a good high end instrument will hold its value much better than a budget or mid range one, so in the long run they can work out cheaper. I’ve probably had about five instruments for an initial outlay several years ago and if I sold them all now I’d make it back with interest.