I'd love to say it was pure love but for me it was actually purely economical... at first.
I auditioned for "Jazz School" on guitar. That's what I played then. But, I had also previously played a half size URB in a church folk group, which the director just brought and stuck in my hands one day. She figured of all the endless guitar players coming and going in the group I was the one most likely to be able to find my way around a new instrument.
So, cue back to the audition. I got waitlisted as a guitar player, since there were already about 1000 other excellent guitar players auditioning. But on the way out they asked if I had ever played any bass. I explained the 1/2 size story, and they made me a deal on the spot. I could wait to be called as a guitar player, or I could come back and try again on bass, and if I passed they would cover half my tuition.
So I came back for a bass audition -- and since I didn't actually own a bass at the time, Reggie Workman lent me his! -- now either because they were desperate for bassists or because they thought I had the potential to be a great bass player, or maybe a bit of both, they passed me on the spot, and saved me about 25 grand in tuition over the course of the 4 year program.
Before too long, I did fall in love with the upright, in spite of all the obstacles, and I never looked back. It turned out to be a good move, because I got a lot more work than I ever would have as a guitar player, and I now realize I was born to play bass and not guitar.
So -- it was all for the love of money!
Thanks, Reggie!