But the key point you seem to be missing is that not all startups are web apps. I agree that if you are a Lamp stack web app -- or most any web 2.0 startup -- Bizspark probably can't offer you much. But what if you write Windows desktop software?
There are entire business (some quite large) which build nothing but Office plugins. Never mind the wide range of vertical applications for businesses that almost exclusively run windows. Microsoft's ecosystems is huge and very capable of sustaining quite a few startups. These startups need Windows, Office, and Visual Studio licenses. Of course they will include IIS and Asp.net in their list of benefits. Besides, Asp.net really isn't all that bad of a choice if you just need a company homepage or some kind of low volume or limited access web service.
My question can't possibly be the first time he's heard that; I was astonished that he didn't have a pat answer that was productive. When we have scaling issues, we'll have all the traction and revenue we'd need. BizSpark doesn't help us at that point.
More fail: http://www.sachinagarwal.com/microsoft-bizspark-is-a-joke