I've been wanting to have one made...before you yell at me, I want one with MY initials on it to finish off the new wood I fit to previously- bubba'd-but-now-restored rifles.
I suppose there are ways of using the repro stamps correctly to make a faithful reproduction, but still make it obvious that it's a repro. I think this is important to preserving history too - e.g. I saw some uberti trap doors. Wouldn't mind having one - unlike an original you can shoot jacketed bullets in it without destroying the barrel. Keeping awareness alive is just as important as preserving the original peices.
But, I think you all are talking about the practice of taking original stocks and weapons and re-stamping missing or faded marks? To me that strips the service history from the weapon and is an abomination. It's no where near the same bucket as steaming dents, remove grime to feel the wood again, etc...improve fit and function for continued service.