Very funny ok4550, I almost dropped a rotor on my foot.
I just found a website that repeated exactly the same things you said:
Mercedes front brake disc last about 50,000 miles. All rotors, front and rear, are stamped with a minimum thickness allowed but we do not recommend resurfacing them. Replace them! They are inexpensive.
I also found several websites quoting the price of rotors.
Thank you ok4550, craig58, and benzman.