There is what for the other games?
As I said, there wasn't a PC version of Giants. I acknowledged the PC version of SSA - but, as I said, the sales left a *lot* to be desired.
Just being able to hit a magic button that ports the code to PC isn't enough. The game can't really be distributed via digital download (even more so since this one requires a new portal) and retail stores would be reluctant to give shelf space to a title that underperformed so badly the last time - even more so when you consider that this game would require an oversized bundle box (i.e.: more shelf space).