I'm not sure the term "original owner" means much at all anymore for any period of comics. Pretty certain most of the major pedigrees that have surfaced in the last few years all went through the press before they even saw the first auction (or at least the top few 100 books in each collection). The OO term is very over used in my opinion to entice people for the very reason that you describe, that the books may be prime for "improvement". And I think that's probably the case with all books- gold, silver, and especially bronze.
Although I do like to dream that there are some books that will come to the market for collectors from collectors without all the garbage in between.