[obscura]

> So while some may find annotations distracting and annoying, there are some that can find those same annotations to be pointers to a fuller understanding of the material so annotated.

The problem is that there's no guarantee that your marks/annotations will add value for the next reader. It depends on who you are.

Of course, such value is subjective, so it depends on who the second reader is.

Because of this, my preference is to have an unmarked book.

Also, the way in which you mark is the book makes a difference. Using the margins is fine - I can live with that. But when the body text is underlined en masse or seemingly arbitrarily with pen and by freehand, I think it's really hard to argue that value has been added.