So many ebooks missing real covers

I know, the cover is not what you read as far as the book contents.

But I really enjoy seeing the original cover for the book. It kind of sets the tone for the read and gives you a feel for the experience. It can also show the history and some very nice art.

I wonder why so many ebooks are missing the original cover scans?

It is so frustrating to receive an ebook, then open it to find a Microsoft or Calibre or some other 3rd party cover graphic. If people go through all the trouble scanning the entire books pages, why not include the cover?

It is very easy to go online and get the cover image and insert it into the ebook file, but shouldn't the maker of the ebook do this and not the end reader?

It is really aggravating to get a complete series of a book, only to find out all the covers are missing from them.

Oh well, my rant is over. Is it just me or does this bother any other people?

Thanks