Earlier quoted context omitted.
Can you provide a concrete example? I can't recall ever seeing such a disparity in the US having lived in the midwest, northwest, and east coast. Perhaps you're in a different location?
I've seen it frequently, especially when road configuration makes one station more convenient to, e.g., a freeway on/off-ramp.
And wouldn't you know, I use the more expensive one, because it's the one that I can get to without making a bunch of turns.