You don't have to support IE. Just like an iPhone developer doesn't have to support Android. Or an OS X developer doesn't have to support Windows. You give up some market share, but it's a standard tradeoff == more work vs more revenue?

There's nothing to be sad about, it's a decision we make everyday. If IE is so painful that the revenue is not worth it, then don't do it. We currently don't support OS X. I'm not sad when Apple ships a new version of OS X. I just know that the 10% of the market that they own is one that we won't support. I'm fine with that, and have been for a while now.