Price has the track record of an ace, which is why he's paid that salary. I'm as nonplussed by his performance so far as anyone else (though he's been a lot better than his ERA would indicate, and equating him with Buchholz this year in any way is kind of a joke), but there is every reason to show him patience.
Clay, on the other hand, has a track record that says even if you get a few good, if not great, starts from him at some point, that's just how you know he is about to fall apart or go on the DL for the rest of the year...guaranteed. I used to defend him 2-3 years ago, but I've been around that carousel too many times. As the song goes, he will let you down...he will make you hurt.