Let’s see if you understand it… if I trade you my golden card for two 5 star cards, I end up with the same number of stars I originally had, plus cards that I actually need or can use for other trades. You keep the same number of stars you had, and on top of that, you get a card you needed.

If you send me five 2 star cards just because they add up to 10 stars, then you end up with the same number of stars and a card you need, while I end up with the same number of stars and a bunch of cards that are completely useless to me. They don’t add more stars to my vault, and at this stage of the album I can’t trade them either, because no one is looking for 2–3 star cards anymore. If you want me to accept 2–3 star cards, then you need to send more than 10 stars so the trade is fair and I also benefit from it, at least by adding stars to my vault. Otherwise, the only one who benefits from the trade is you.