I think it makes sense.
Not everybody will want to go out and purchase a new controller just for a new game they happened to download.
Better chance of getting more downloads if you don't need a separate controller.
I got a 77% mainly because most of the answers are dumb and an opinion
And how is "you can put OSX on a windows machine and windows on a OSX machine." not false? Hackintoshes can only run on certain parts.
The World may never know.