Lucas and Peyton's interaction started well before he joined the Ravens. For me she was intrigued by him in 1x01 and her feelings/interest grew from there. I don't think it had anything to do with him being on the basketball team. She trashed Nathan for the same thing, because Nathan went overboard on it. I think it has more to do with who Lucas was as a person, and Peyton didn't give a rat's ass if he wanted to play basketball. I think she would've still fallen for him if he was on the debate/chess team.