Because I got a ton of editing/writing done. And it felt terrific.
I've immersed myself so fully in my novel that even when I'm not sitting at the computer, I'm thinking about it. I've moved scenes, deleted others, gotten rid of entire paragraphs, and left some rather good ones.
I definitely felt the joy of writing this weekend.
Are you feeling the joy right now? If so, tell me about it. If not, you can share that, too.