Because Daria was kind of a bummer.

Quinn: "Please? You're the only person I can trust to do this! I can tell by your eyes..."
Ronny: "Really?"
Quinn: "Yeah! They're so... sincere!"
Ronny: "Well..."
Quinn: "And your face, it's very... honest! You're so nice, and dependable, and-"
Ronny: "Nice? Sincere? You're never gonna go out with me, are you?"
Quinn: "No."

Daria: It appears the unthinkable has happened.
Quinn: Tube tops are coming back?

Quinn: Look, can you please stop talking to me? If the Fashion Club sees this I'll be like one of those baby birds that gets put back in the nest but the mother knows it's been touched by a human and pecks it to death. Understand?

Helen: I don't think you realize that modeling is an extremely competitive activity...
Quinn: So is dating, if you do it right.
Helen: ...in which your value as a human being is decided entirely on how you look.
Quinn: When does the bad part come in?

Helen: I can't have another fiasco like last Saturday night. Think of how it must have felt when those three boys all showed up here at the same time!
Quinn: It felt great!
Helen:I meant for them.

Quinn: Yeah, I just found out poems don't even have to rhyme. How easy is that?

Sandy: Can't... I... rest?
Quinn: Did Cleopatra rest when she was inventing mascara? Did Neferiti rest when she was posing for statues? Did Helen of Troy rest when she was doing whatever it was she did? Beauty never rests! NOW, SWIM, YOU COW, SWIM!!!

Quinn - You can't expect me to choose a boyfriend right away. That would be like eating the first pancake off the stove. You have to feed one to the dog.

[Counselor holds up a picture of two people talking]
Quinn: Let's see... they've been going out for awhile, and he's upset because other people keep asking her out, and she saying she can't help it if she's attractive and popular, and besides, nobody ever said they were going steady, and if he does want to go steady he's got to do a lot better than movie, burger, back seat, movie, burger, back seat, because there are plenty of guys with bigger back seats waiting to take her someplace nice!

Quinn:
The greasy fry
It cannot lie
Its truth is written
On your thigh.