I don't understand all this talk of getting banned on Bing (I've seen it in other threads too). I've been using Bing and getting a significant amount of rewards for years without a problem. I just use it normally instead of Google (in most cases). I can't imagine using Bing in such a way as to game to system for extra points since it seems like you would just be going though a lot hassle for very little in return.
As mentioned a couple times above, avoid the 3 month deal since the 12 month deal for 2900 points is obviously much better. Just use Bing like a reasonable person and don't be greedy and just be patient.