The unauthorized copy gets them no money in addition to taking away from print sales. An authorized copy gets them some money. Last I checked, some was better than none. So they can resist ebooks all they want but it won’t get them anywhere. The more people get used to reading on a device, the less they will tolerate having to go out and buy a paper book. If publishers don’t make it easy for customers, they’ll get it off the net for free. If they charge an unreasonable price, same thing. Most folks have a threshold where they will justify it. Sure, some will always get the pirate copy. Worrying too much about that can make them miss the big picture. I think most will buy if it’s reasonable and simple.
