You know what's even worse? Opening Kaladesh packs and acquiring two mythics that I paid for in cash as pre-purchase. That burns like you wouldn't believe.
We realllllllly need a dupe system, pronto.
Remember this set is actually smaller than usual at 155 cards. They said there'll be 2 more mini-expansions with more cards for amonkhet in the future. So if you already have what you want, start saving!