MonoTouch and Mono for Android are they main reason, that Mono is in such a good shape, after the near death experience when Novell fell apart. Both products are the primary source of income for most people working on Mono and both products would not stand a chance if open source. Why? Because they target developers (who can compile their shit from sources) and open sourcing them completely would remove any incentive to pay. (And no, selling support would not generate significant income.) The core (Mono, MonoDevelop and MonoMac, which is very similiar to MonoTouch) are already open source. Open sourcing the rest would probably kill Xamarin and take half of Mono down with it.
On a different note, I disagree with Miguels opinion regarding patents. I also think that he has shifted slightly on the political spectrum over the last decade (a small movement towards the center from the far left), as well as that of software politics. He has always been pragmatic, though and even now, I think, his moderate opposition is a good reminder to somtimes step out of the echo chamber and avoid the mistake of falling into extremist views.
On a different note, I disagree with Miguels opinion regarding patents. I also think that he has shifted slightly on the political spectrum over the last decade (a small movement towards the center from the far left), as well as that of software politics. He has always been pragmatic, though and even now, I think, his moderate opposition is a good reminder to somtimes step out of the echo chamber and avoid the mistake of falling into extremist views.