I had the same confusion at first, until I realized I could also drag and drop to order. So I then assumed #1 was the best and #4 was the worst.
For 5 bucks, please give me sleeves. After that you could make the deckbox better or add another booster, but neither is a big concern to me on a personal level.
From a business perspective though, I think making the deckbox better would be the better choice. The user now feels like they got one more quality item instead of a higher quantity of the same. So their extra $5 bought them the same boosters, a better deckbox AND sleeves. Probably feels like a better deal than 1 more booster and no deckbox.