Personally I got C2 just for HTML5 publishing.
all the other export functions are extra jam!
I think that C2 can successfully manage to export to Windows desktop + Mac OSX + Linux using the Node-Webkit toolset. Windows8 already provides a good layer for html5 apps, and C2 has already made good use of that feature.
It seems that Blackberry is interested in the C2 technology and we might get a seamless export for BB10 too.
All that, for a 1 time price is already way too good if you ask me!
Who knows maybe in 2013 new technologies will come out that will make it possible to wrap html5 games for mobile, for free, like Node-Webkit does today for desktops