It's generally a very, very bad idea to base a trade on a claim of how many "stars" a magic pin has, because the trade window does NOT show how many stars a magic pin has.
Many people have been told that they will receive a "5-star", do the trade, and then find that they have received a "1-star" instead. A typical scammer will have in their inventory both a 5-star and a 1-star magic pin, demonstrate the long-lasting 5-star pin, but then trade the 1-star pin.
Trader beware.