[doctorwho]

Ignoring almost 30% of the internet and calling it a "feature" doesn't make it the right thing to do, or the smartest thing to do.

As you grow and (hopefully) become more successful you may start running into friction from IE users who want to use your service but can't.

Once you've saturated the market of other browser users, how will you continue to grow?

When you get there I think you might regret not investing in IE support today.

What about your application is SO compelling and SO difficult to support in IE that you can afford to ignore that entire market segment?