There might be more gold on the ocean floor than all the gold we have ever mined, but we will never get that gold because its too uneconomical for us to get.

Same goes here, the 5th of the market is a non-consumer market for us. Those days are gone where every computer with a browser was a potential consumer.

At this point we have to ask the question, if you are still using IE, what business assumptions can we make about you, and are you really worth the cost spent to go after you?

Though, I will say you have not asked that last question. At least not in a meaningful. Otherwise, you would not be dominated by the larger fish in the ocean that do go after these customers.