Ability to colaborate
I do most of my work in collaboration with others. This is a great program, but it does me almost no good if I can't share it with someone even if they also have Shaxpir.
Alisha Payne commented
Agreed. I co-write all my books and we currently use GoogleDocs so we can both work in the same document at the same time. I'd LOVE a program like Shaxpir or Scrivener that gave us this ability.