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"In reality we've received exactly zero requests for IE support, angry or otherwise."Why would someone bother contacting you when it appears that your site is broken? In other words, the call to action doesn't display technical competence - indeed it implies a level of technical incompetence which probably is not justified.
"We're really sorry, but Paydirt isn't playing nice with your browser" doesn't inspire confidence in the product - it doesn't suggest a high level of customer service, either. Would I really want to trust something as critical as invoicing to this company?
Furthermore, not supporting IE doesn't scale well. At 10,000 users 1.6% is $1600 a month in revenue. At 100,000 it's nearly $200,000 a year in potential revenue - all for what is mostly a one time expense.
Finally, where does this leave room for expanding services such as letting my customer's see their project in real time?
I don't see a business case for it. I'm not saying that there isn't one - just that it hasn't be made.