I think it's a good train of thought, but at the same time this reminds me of a discussion I've had with a friend of mine: We've both been playing for most of our lives, have developed a certain aptitude and built a reputation among our peers, etc, and we still dink away on mid-level instruments. While that's perfectly acceptable and gets the job done, it's time to get us something good. Take the next step up.
For him, that has led into a GAS spiral, finding THE ONE. I, myself, am going the custom build route and hope it's turning out the way I imagine. Maybe we'll both find out that there was nothing wrong with playing Mexicans or low level Ibanezes.
I fully understand the task to find THE ONE. Having one bass that perfectly fulfills your needs is the goal. Disregarding the price-tag, because you could have one favourite axe without spending too much. That's the point with the DIY-basses, I think. Not too much money, but in a specific way "custom-built" and with emotional bonding, because it's your own work. I have strong and good feelings towards a Franken-Bass consisting of an old and simple (lightweight) Hohner-Body and a Squier P-Bass neck (with small J-Bass dimensions). Putting EMGs in it - simply perfect. With a bass you like studying is bigger fun anyways.
The drawback with searching THE ONE: you have to get rid of the "candidates" again ...