Ah, I see it's not so RAMPS-friendly, after all. As for the cost, well I assume with Pi you would use it to gain all the premium features like a touch LCD display, custom Pronterface, wireless and network printing, onboard slicing, etc., and then, since you have some bandwidth, take over many of the duties typically performed by RepRap firmware and drive RAMPS directly, free of Arduino. But you are quite right, especially if you're making your own boards the low cost and convenient encapsulation of Arduino-based controllers are hard to beat.
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