the last time iv played the sims 2 was 12 months ago

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I wouldn't jump the gun and sell my Sim 2 base game and expansions until I've played the Sims 3 and see how it is. There has been many occasions where I've bought game sequels, only to find that the one before was much better.

I probably wouldn't sell the games, anyway. It's still a damn good game and I can see myself playing it in the future, even after The Sims 3 comes out. If I ever feel the need to give my games up, I'd give them to any of my siblings instead of selling them to some stranger.