Stop justifying and be proud.
A lot of authors are taking up blog posts, twitter updates, yadda yadda (yeah, my usual pet peeves) to justify why their book is an e-book only. Whether they are with an upstart e-book publisher (who, by the way, are all AWESOME) or they're self-publishing, they need to go out and write and write and write about why they aren't on pieces of paper.
You know what?
At this point, it's unnecessary. E-books are here to stay. They're books. They have words, sentences, paragraphs, chapters, and eventually tell a story. If an editor was a wonderful person and picked you up, that means he or she loved the story. If you and your agent sent the book around, got a few close calls, but didn't get an official bite... and you published it yourself... if you're getting good reviews. Then stop worrying.
Too often e-book authors like to jump on the the interwebs and act like the little brother. They NEED to matter. They NEED to be noticed.
To use an overused sports cliche, act like you've been there before.
People respect e-books. They buy them. They read them. You've made it. Be happy, be proud.
But all these blog posts, Facebook statuses (stati?), and Twitter updates explaining WHY YOU HAD TO PUBLISH AN EBOOK... are written for once small, teeny, tiny group of people.
Other e-book writers.
And maybe a few people considering going e-book.
Remember your audience should be everyone. Not just this corner of the blogosphere that the crime fiction or sci-fi or paranormal adverb-filled romance community. More people read than the 200 people who visit your blog.
You're an author.