It seems like what most residential buyers do is insist that the seller make the house 100% up to their standards, either by never looking at less than pristine listings or using the inspection and appraisal reports as leverage to demand repairs and upgrades.
Of course, they wind up paying a premium even if they think they are getting over with the second method. The seller is not likely giving anything that he doesn't get back in purchase price if he can help it. I suppose they are willing to play it this way either because they don't know better or it is of paramount importance to them to roll the repairs into the mortgaged amount.
If you are authentically looking for a fixer-upper be aware that the seller may have built the expectation that you are going to demand perfection and has built the cost of add-on demands into the asking price. In other words, you may wind up leaving money on the table. Then again. maybe not.