Depends on what kind of girls you're trying to attract.
I can definitely live without girls that are attracted by people because of what kind of transportation they use. If she doesn't like my sqeaky, rusty citybike that's too bad.
I read an article somewhere that says all women are (on obviously varying levels) attracted to the "bad boy." More specifically, women's minds are wired to respect men who take risks, of which riding a motorcycle is one.
Full disclosure, I'm in no way a bad boy, nor did I get my motorcycle to get chicks (as I was still married when I got it). It's good on fuel economy and maintenence and it's way more fun to ride than to drive a boring car. Also, it makes me feel cool, which is a nice perk.
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I think it's safe to say most people on this forum could hardly be classified as "badboys" be they adolescent nerds or middle aged family fathers (and everything in between).
The thing I look for the most in a girl is that she looks and is friendly.
On a nonrelated note, The Book of Mormon is definitely my new favourite musical.