Do you know for a fact that a realtor wouldn't have gotten you more money and negated that savings? Was this recent?
Having a realtor doesn't automatically give you the highest selling price either. I've seen time and again realtors entering the market that are: laid off and can't find work, housewives that aren't able to enter workforce as being home with kids for years stopped their careers, and people thinking its a quick buck.
not saying all realtors are garbage, but the majority are useless and can't do any more than an informed person can do on their own. They just need to put in the effort.