Mainly to move actual enthusiasts up to the real AMG. Same reason M is going manual on only the M's. Enthusiasts will pay the differential.
I'd argue that the C300 is only available in rwd for the price point. Like BMW, MB leaves off mechanical LSD's on non AMG cars, so pushing a rwd C300 much less C43 hard will reveal that limitation in a few seconds.
Sadly I'd also bet the next C63 is awd just to improve its magazine numbers slightly.
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