What do real writers want from a writing host like pen.io or quitewrite

webapps like pen.io and quitewrite provide a service where writers can have a nice place to host their writing outside of a blog, pdf or ebook format. Are there any writers out there who KNOW what they want? What are the key features, what keeps you coming back and what are the nice-to-haves.

Some possibilities to get the discussion started. - Sharing features ( Twitter, Facebook , Reddit?) - Unbranded by the host (ie. no quitewrite logo) - WYSIWYG - Custom CSS - Pagination - analytics - Anonymity - ability to sell the content - Private / Public viewing - blog cross posting - short-URLs - Permanent vs Editable - "show more from this author" link - HTML, Markdown or other markup languages