Runners don't have need a lot to participate in the sport. I mean it's not too complicated, shorts, shirt, shoes...
They might as well spend the money on nice clothes. And I'll be honest, the more expensive shorts are much nicer.
Cycling shorts are usually even more expensive. $60 is usually an ok pair. You want something nice, google Assos, Copa Forma, or Castelli. That stuff is expensive. But really nice. I have a couple Castelli things.