Bing advertising is cheaper than Adwords for sure. I am mostly worried about organic traffic. I have noticed that my traffic from them kind of comes in small bursts.One of my friends has an ecommerce website and he uses bing advertising. He said he gets more sales through bing than in adwords and it's also cheaper.
I should just forget about Bing and only worry about Google?Yes, i do agree with above answers if your submitted the website for the Google search engine then their is no need of worrying about the bing.