That's strange. We usually pin trade at least once at each park, and we visit WDW a couple of times a year. We haven't picked up any bogus pins. They have all been real Disney pins with proper markings. We do see a lot of the same pins though.
There are several kinds of scrappers and many of them will in fact have the proper markings. It's only upon closer examination and research that you find out. Here are some of them.
1. Deliberate or unintentional over runs. These are supposed to be tossed but rarely are, hit the black market, are full quality, and will have the proper identification.
2. Seconds and rejects. These are supposed to be tossed but rarely are and these will have proper identification too.
3. Pure Bootlegs. These may or may not have proper identification.
Unfortunately, one can never Identify scrapper #1. And other than to be aware of which pins seem to have a lot more out there than they are supposed to, there isn't much can be done about it. Websites usually have lists of these.
#2 can usually be identified but not always readily and there will be information at some websites on how to identify them. Pins where this is excessively the case will also be listed on various websites.
3. These are the easiest to identify. Many will be obvious like an R or even X rated Jessica Rabbit. Others won't have the proper identification on them. Many will be of cheesy quality.
But I think the biggest inhibitor to the value of pins is simply the availability of so many pins. Do I feel any need for that exclusive run of 500 pin X that costs $50 when there are so many other nice pins out there anyway? And that reduces the value of that pin.
I guess my advice is don't try and trade for value. If you like a pin that you see at Disney, buy and keep it.
Pardon the newbie question, but is wearing a lanyard with pins a sign to others that you're expected to do pin trading with them, if they approach? I've been buying / collecting a few pins, but I buy the ones that I want to own & keep; I'm not so interested in trading them away. Usually I'll wear a couple of pins on my shirt when I'm at WDW/DLR.
No. In fact, it is pin trading manners to ask someone if they want to trade, and if they say no, that is aok. You don't have to accept any trade and you don't even have to entertain the notion of trading if you don't want to.