It doesn't make sense to cite the highest price you've seen them sell for and claim that should be the value of a repro topper. The old argument that "something is worth what people pay" always relies on scarcity. Now, if you're reproducing them and hoping to sell them to dozens (or hundreds) of current owners, you can't really rely on what one desperate person paid on ebay as a pricing method.
I think this is less about trying to help a guy out, and more about trying to protect the value of a pin that you likely just landed in your own collection with the topper. I bought the game for the game, the topper is neat, but I'm not a buyer at gouge prices. I'm just not that worried about any topper.