I think there are people you continually go back to, hoping for something new, something different. But the fallen hopes and emptiness they leave you with is only good for writing a few short poems – it does nothing to enhance your thought process.
And then there are the ones you want to run away from, simply because they challenge you, are unafraid to stimulate your brain and push you to your limits. You think, Why the hell do they keep tailgating me? Well, to encourage you to move forward, of course.