"Hmm, I think if it was in the print book, it should be in the ebook."
That depends. If an artbook: yes. If technical illustrations, they are probably a necessary part fo the book. If photos in a biography: no as far as I am concerned, but I guess that some people might want them. If pretty pictures in a scifi, spy or mystery novel: generally no thanks; I have in my time seen a lot of illustrations in fiction books and mostly found them to be uninteresting.
I think it is at this stage important to get the prices down on ebooks, rather than add extras that doesn't really improve the contents. Someone has to pay for all these extras; and it is not going to be the publisher.