WHY PEOPLE why (COD4-MP)

why did they lock a bunch of the modes for MP??? I mean come one what about the people that can't play for hours and hours a week to get my rank up, and even when I try to play I don't have anyone to play with cuz they are all playing the other modes...I sat and waited and kept trying to get into a TDM game and after an hour gave up...I'm sooooo glad I only rented this game cuz that alone makes it not worth it FOR ME, (others may not care) but what about the casual gamers that cant play a lot I don't think that was a good idea...anyone else agree?

These unlockable modes aren't solely intended for the powergamer. They offer a challenge and the chance to experience something "new" some time after first getting the game. Think of it as encouragement to continue playing as well as a higher replayability factor.

As a casual gamer, I understand where you're coming from. However, marketing and design teams decide upon these features because they feel they best complement the game. Enjoy what you have or, in your case, rent it.