that is a bad logic.
amazon owns the platform so they can do what they want and i cannot complain.
but to think that this is good for customers is hopeless.
different people would have different needs. where do you draw the boundary?
* can we have different publishers offering same book with identical content?
* can we have different publishers offering same book with different formatting?
* can we have different publishers offering same book with different spellings (color vs colour)?
* can we have different publishers offering same book but one offering annotation by Shakespearean expert MrSupreme?
* can we have different publishers offering same book in different language?
at one extreme answer is yes, at another you will think no. the boundary is always subjective. only solution is "freedom as in speech". let customers decide what the heck they want.
today same physical book is offered in 100 different formats (by same publisher) - leather bound, paperback, hardcover, asian edition, EEE cheap edition, school edition, new edition with spelling fixes, new edition with commentery. how does that work?
what amazon needs is to make user feedback system. how hard is to sort by number of copies bought and buy the top selling edition?