At 10, it was because Gene Simmons did it, and he was terrifying and strange (what was I thinking?)
At 14, it was because I saw a picture of Sting with a Steinberger XL2, and I just loved the idea of playing a plastic stick-so punk. When they came out with the guitar, the ambition changed accordingly.
I didn't take up the bass until this year, however, when my friend needed a bassist for his new band. I had been a good, if rather garden variety, butt rock guitarist for years, but decided that I at least needed to work as a weekend warrior instead of merely dedicating myself to the unheard songwriting that I had been doing in solitude for decades.
That being said, I'm not someone who plays bass as an afterthought. I'm obsessed, seeking out a serious teacher, and, for the first time in my life, am practicing with a metronome.
I play like a "real" bassist, without a pick. It's a completely different instrument, and I'm back to almost being a beginner, but the intrinsic rewards are, for me, huge.
I love the rubbery, strange sounds you can only make with a bass, and, how, with the punch of an old fuzzbox button and a pick hidden up your sleeve, you can switch back to guitar playing as an onstage gimmick
