Part of the problem with customs builds is the anticipation/reality gulf. We're anticipating something extraordinary, but it can only ever be a bass guitar, the rate limiter being that in most cases even the most expensive example is made of the same materials (wood and metal), of the same dimensions, and built to the same functional criteria as nearly all other bass guitars. So, whilst we're expecting something amazing (after all, we designed it to suit our personal needs and a craftsman hand built it over months, even years), we tend to get what is to all intents just another bass guitar, and we tend be disappointed, at least a little. It's the opposite reasons to why people say how amazing Squiers and Harley Bentons are, largely because they exceed our expectations.