Ah, but consider the likelihood of drawing a second card that's exactly the same! The likelihood gets halved each time you get the same type of card, so in essence, getting a second card is the same as getting an uncommon card. Getting a fourth card like that is almost the same as getting a rare.
Also note that the Quick keyword adds counters to the card: Sniper gets a boost out of it, while Lancer discards all of such cards from the opponent's hand. This card requires hoarding a bit in order to trigger the effect, so the counters are more likely to happen. Besides, that requirement uses up more slots in your hand than other cards, and isn't that cheap to get rid of.