I wouldn't know a "scrapper" from a "real" pin. I trade for fun.
Here's what I would consider to be a great trade:
I'm in line for, oh, let's say a bus. Kids in front of me are looking at my pins. They keep looking, but don't say anything, probably too shy. Trading is very new to them.
I ask, kind of loudly, so as to get their parents' attention: "Would you like to look at my pins?" I make sure the parents are watching the entire transaction, and hopefully, they don't interfere, telling the kids what to do. I think it's a good lesson for kids to do their own trading, if they're old enough.
I'm careful to keep my distance, I don't want to be perceived as coming too close to the kids. One child may say something like, "I like that one," pointing to a pin that I don't care about, which is most of the ones I'm displaying. (The ones I want to keep are in my room. I may have just picked up one I want to keep, though.)
I say, "Do you want to trade?" Child says yes, and I ask which one of theirs they would like to trade for mine. Just for fun, I might say, "well, how about that one?" and point to a different one of theirs. If they shake their heads no, they want to keep that one, then I say, "Ok, I guess I'll take the one you want to trade," without caring.
We each take off the pin, and drop it in the hand of the other. I have no idea if I got a "scrapper" or not. The point is, the child got the pin he/she wanted. And I exchanged a pin that I don't really
want, for probably another one that I don't really want. Win-win!!
I'm not about to whip out a magnifying glass to look over the child's pin, or dig out a guide book. He can have my pin from Cars-I'm not much of a fan of that movie-and I'll take his Mickey Mouse pin, which is always something I'd like! Did I exchange my scrapper for his non-scrapper? Beats me!
Child is all excited. "Look, Mom! Look at the pin I just got!!"
It's about the trade, not the pin, for me. I've made a child happy, and that's what counts.
I'm going to get a lot more pins from Ebay for our next trip, just to trade.