| I wondered the same until I noticed that the single-string bridges on my Ibanez BTB were not exactly parrallel or even. This allows the string to be straight all the way though the bridge to the ball. I don't know for sure, but I have to assume that there are advantages to this. And you don't have to worry about running out of adjustment on the low strings because the whole bridge for those strings is set further back. Also the ball is set into the body of the bass, so it's kind of a half through-body string design.
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