I don't know why I always end up in scrapper discussions, but here is my experience with pin trading. First of all, I want to say, I don't pin trade, my kids do, they don't know or care what a scrapper is or what one would even look like. I bought a 100 pin lot of ebay, yes, for around .85 cents each and probably from one of your red or yellow sellers.
The pins arrived safely and promptly, nothing fantastic, but good basic trader pins. They were not discolored or damaged or anything that I could tell. Now I'm not going to take a loupe and look at them, but from the naked eye they looked fine. So we go to the parks, from Downtown Disney to Animal Kingdom where they traded with a gentleman that had a jacket full of pins who had been trading for 10 years. At no time did anyone comment, put a pin in their pocket or even notice that these pins were what you call "scrappers." This is one of those disboard paranoid fabrications, such as, you'll get kicked out of your hotel for using an old refillable mug.
The reason I'm taking the time to even type this is that what you say happens and how sensitive everyone is about these little pieces of metal is ridiculous for the casual pin trader whose 5 or 6 year old wants to trade some pins. Hate to say it, but very few of these pins have any real serious value. Someone comes on here and asks a question on how to get some cheap pins and they are presented with this list that they "must" choose from or they are a criminal.