At anything like 4/64 I'm all in on Fowler. The bat is above average, he adds runs on the bases, and I don't think it's likely that he's a bad corner OF defender.
I suspect that you wouldn't offer anything of actual value for him. Which was my point: I'm content to just take the Util production until teams stop giving him full PT, because it's been my experience that his value on the market is basically nothing.
I never said it would be rational, but I'm willing to bet that Trumbo gets more than 3x what Carter does. It helps that most teams will see him as someone who can play defense. He might actually be good at first base.