Glu Mobile have certainly been active in the Windows Phone gaming, with a number of Xbox Live titles. One of their previous releases, Bug Village (reviewed here) explored the freemium space of gaming, where the code is a free download, as is the playing experience, but that experience can be enhanced through micropayments and in-game billing. From the review:
Bug Village is an important game for Xbox Live - it's a new genre that's proved successful on other platforms, from social networks and websites to tablets and smartphones. Proving that the concept and user base will accept a freemium model will give others the confidence to get involved and bring some fresh thinking and mechanics to a freemium game on an always connected social device.
In the end though, it comes down to money. De Masi again:
Things that make it in the top 50 grossing are successful; maybe even things in the top 75 are probably successful at peak. For a company like us that can put out 23 new games in 2012, and also have a half a dozen games from 2011 we're still supporting and generating success from, that's the first tier of success you're looking for. We don't green light anything that doesn't have the opportunity to be top 10 grossing game.
The full interview is at Fierce Mobile Content.