Wasteful MSN adCenter packaging

Again off topic, but I am quite frankly baffled by the MSN adCenter welcome package I got in the mail.

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The search marketing guide may very well have great information in it, but why did they decide to add a piece of Polystyrene (aka Styrofoam)? To make the package look bigger (and therefore presumably more attractive to me)? Or to somehow protect this valuable content?

I feel that this is a very poor environmental choice that adds zero value to me. I am no environmental saint myself, but this strikes me as really pointless. How about using a normal envelope? I can assure you that I can handle it and that I will not judge the guide by its cover packaging…