I cannot imagine how Microsoft developers begin a project. "Today, I'm going to write this new web app to change the world! Right after I spend the day setting up Microsoft Team Studio and purchasing software licenses for every computer I plan to use!" How inspiring.
As in "Today I'm going to write this new web app, as soon as I install Eclipse, Django and SVN" would sound just as silly. It's just development tools.
Oh, and for what it's worth, Microsoft will give you 15 seats worth of MSDN Universal for $400 if you tell them you're a small business. Per seat, the MS tools are the cheapest part of setting up a new dev box for me. (CodeSmith, ReSharper and Ants Profiler are the ones that hurt!)
And, for what it's worth, the open source community will give you unlimited seats worth of all the best web development software in the world for $0.00 :D