Do you mean sell as in for money? Or sell as in get people to adopt? Under an Apache license, I doubt it's the former. Although they could sell the Visual Studio tooling.
Use the tooling to sell the platform? It might be in Microsoft's interest to have some mindshare I this space; JavaScript is a significant part of the windows 8 story from what I can tell.
Do you mean sell as in for money? Or sell as in get people to adopt? Under an Apache license, I doubt it's the former. Although they could sell the Visual Studio tooling.