I hope honestly that Bing can take Google of it's high horse as king of the internet. But honestly it's great that they're getting people to use their search engine. I always like MSN's demographic better and I don't have to jump through holes to do paid search with them.
I assume that, since you are getting a ton of traffic from Bing, that you are getting little from Yahoo or Google. Since Bing is only a gnat compared to Yahoo and Google, perhaps you need help with your SEO. After all, only 7 or 8 out of every 100 search engine users bother with Bing so that's pretty bad.