Yeah, but 64 bit doesn't give your users anything usually, so it's a tax that is more of a drain on smaller software shops. Especially consider that lots of programs and especially games have a spike of sales when new and then sales decline to nothing. There may not be new versions, ever. So going back and updating them is pure loss for the developers.

This is one reason why ecosystems like Java are so valuable! The 64 bit transition was so easy for it because of the common insistence on "pure Java" for portability. Combined with pointer compression 64 bit was hardly noticed.