A bigger reason is because without proof you can't prove its not lead. You will have a hard finding anyone to pay for good pewter because without working knowledge it's all lead. Until you touch the 20 or so different kinds of "pewter" it's hard to understand.

I know I sound like a broken record on this, and I'm probably pissing off a lot of people. But I've been studying pewter for the last two or three years.