With thirty years experience, there are a few things I learned. Buyers and sellers are like oil and water when negotiating an offer on their own. Price, location and condition will always rule the marketing ability of a property. Listing and selling is nothing, it is getting the transaction closed and a large percentage of owner sales never make it to the closing table.
Maybe some people out there like to haggle directly with a bunch of potential buyers but I hate it. I don't even show up at the closings. I let my realtor and lawyer handle it and that's the way I like it.