the reason I prefer vintage basses is mostly because I have lost touch with what is out there now-a-days. I understand the structure of the older basses. I was never really a "gear head" anyway so once I got my standard 3 that I have now, I quit looking. To be honest, I don't know what a Sadowsky, or Lakland or many of the other basses on here even look like, let alone how they play...
I have not bought a bass since '85. Recently I have trying to get back on the gear scene, but also not having the disposable income to just go out and buy and try keeps me from looking...it is frustrating to get into something I know I can't afford to have.
I bought my "vintage" bass in '83 - a 72 P-bass - not b/c it was vintage, but because it was the model my idol used. I bought my "modern" bass - an 86 Charvel 3b - b/c I liked the way it looked, played, and sounded. It was WAY different than my P-bass.
So for me, the vintage thing just happened...I would like to own a modern bass, and will one day when I get the money to do so, but also have a couple "vintages" in line before that more because I feel that if I am to call my self a "real" bassist, I should own some of the staple instruments of the activity....this is just a weird personal thing for me