One of her more demure looks. - Jordan Strauss/WireImage
The exchange, reproduced verbatim:
Complex: What turns you on that people would find bizarre?
Ke$ha: Um, quarters.
Ke$ha: Yeah, like a bag full of quarters.
Complex: So a guy holding a bag full of quarters could potentially turn you on?
Ke$ha: Like a big bearded guy with a bag of quarters. I think it's some weird pirate fantasy that was unfulfilled in a past lifetime.
So, in a way, it's like that dollar sign in her name is a mating signal of sorts.