But there are a lot of inexperienced computer users, who just don't know how to upgrade any software. I think most of them use IE6. If those people will see you

But there are a lot of inexperienced computer users, who just don't know how to upgrade any software. I think most of them use IE6. If those people will see your site is broken, they will just not visit it - they will not even know the reason is their browser.