Just a couple of thoughts on the piracy thing:
Not offering books as ebooks doesn't stop piracy, just look at the Harry Potter novels, or take a look on the "darknet" and you'll be amazed at the number of books available that have never been offered as ebooks. It's not legal, but it's there.
The people who would pirate a book when it's available as an ebook, probably were never going to buy it, anyway.
DRM is silly. There can be no DRM scheme that will be foolproof as long as it has to be made visible or audible to a human being.
So, I think you're right not to worry about offering your books as ebooks. It's just another possible income.
I certainly wish you the best in your endeavors!