I mostly agree, but I can guess one reason why it’s useful. With a game that’s not that old, but well received, I’d expect new players to keep coming in for a while. Not to the degree of when it first came out, but someone like me will wishlist a game and wait until there’s a sale or I have time to play it to buy and play. If the drop off is huge, and sales don’t help much, it does reflect on the game somewhat.