Comment by titanomachy

> The Supreme Court can only rule on cases brought to it.

That might be technically true, but if (1) you're the lawyer representing a party in an important case, (2) you've already appealed that case up to the highest appelate court and lost, and (3) you think there's any chance that the Supreme Court might change the ruling in your favor, then wouldn't it basically be professional malpractice to not petition for certiorari? Of course, they only accept a tiny percentage of the petitions they receive.