It makes sense when you pair it with the tradition of it's existence.
Basically, a 3 round playoff of 3 game series is a little long for a 34 game season where teams usually only place once a week, but single elimination is a little harsh. Two games is perfect, giving each team a home game. But there's no way to do a 2 game playoff except for aggregate.
Last night I recorded the Warrior game because I went to see Skyfall, thinking it would be a great game and we've got storylines with Mike Brown being fired in the morning. Boy was I wrong. This was one of the more crap basketball games I've seen in a long long time, as both teams sucked shooting all night long. I didn't even see the 4th quarter because the Warriors weren't going to fix that shooting woos they had. When you're shooting below 40% and you're just jacking up 3s that miss really bad, that's just a terrible night. I think the only highlight of the game was seeing Andris Biedrens air-ball a free throw, which is something I've never seen before from anyone.