As a regular in selling for the past ten years, I am afraid to admit -not only do I have more than 2 to 3 of a pin, there are times I have had 20 to 30.
This can be for different reasons...some include:
I liked it, and bought as many as possible in the beginning.
Found it on sale for really cheap -so I bought the entire lot that I could (such as at the Cast Store or Disney Warehouse).
Was given extras of the pins after an event was over (like after a Cast event concluded, etc).
Kept getting the pin, over and over and forgetting to sell one, until I realized I had 5 or 6.
Helped my friend make a lanyard full of the same pin (12 in all at the time), and then has me sell the lanyard for him after he had his fun wearing it.
So...having more than a few, doesn't necessarily make it suspect. For me, I check how many times the actual pin itself has been sold all over, not just with one seller. Because scrappers & counterfiets usually go to more than one source for sales.
Diana