All my friends have every single one, but not me. Why? Because it makes no sense... You get 5 maps in each pack, and each pack costs $15 or so bucks. There is something seriously wrong with that, and I have no idea why people are so naive that they will keep buying the packs. All 3 expansions together should cost $15, Activision is ripping people off hard. So how much are you paying for what should be a complete game? Let's see... Game: $60 Pack 1: $15 Pack 2: $15 Pack 3: $15 Total: $105 for a game running on a modded Quake 2 engine with outdated graphics, physics, and below average hit detection. Bullshit... Just had to rant.
That's the exact reason why I never buy map packs, they're just a huge waste of money. I'm in the same boat as you with your friends buying the maps and not yourself, but hey, your making the better decision. I was watching my brother play the newest map pack and I noticed that one map, Hazard, is the map Cliffside from World at War, just made to look like a golf course. So you basically get a few new maps, a new zombies and an old map for $15, not worth it to me, your making a good choice by not buying the maps.