I would definitely pay good money for a full score transcription of CotE. Also, I'd be ecstatic if it had some form of liner-note commentary describing what the idea was behind a section, or how it was accomplished, or just general comments or asides. I'm totally fascinated with the creative process, where artists get their ideas from, and how they execute them, so any kind of commentary would be almost as big a selling point as the transcription for me.