More to the point with ebooks: under how many circumstances would you have multiple editions from multiple publishers? From some of the comments below, Amazon

More to the point with ebooks: under how many circumstances would you have multiple editions from multiple publishers? From some of the comments below, Amazon clearly knows that they are the same book yet are letting them be published without question. Perhaps they should flag ebooks and verify the rights outside of those circumstances. It may be a lot of work at first, but I doubt that there would be as many attempted scams once Amazon starts weeding them out. (The reasons I can think of for different publishers are: public domain books, titles that have been in publication long enough for contracts to run out, and editions that are restricted by region._)