I dunno about most people, but I'm happy with off the peg basses once they have been tweaked to my preferences. Degloss the back of the neck if required, set up with the action low with TI flats, replace the pots & socket with CTS & switchcraft, roll the fingerboard edges, put on an aged pearl pickguard on a mustang, chrome covers on a Precision, badass bridge on a jazz, hipshot d-tuner etc
Getting one custom made would take all the fun out of it.