Realtor fee with only one agent

[Stephanie H.]

I have a bit of an interesting situation and I was hoping someone could assist me. I've worked with the same real estate agent in the past and she has done a great job. I found an auction online, so I brought my agent and my partner and we ended up getting the property. While we were standing there, a man told us about a couple of homes he is looking to sell. He has a price he has to get and refuses to pay any closing costs or realtor fees. The price he is offering is a fair price. He is not using an agent. We are hoping to pick up these next 2 homes ASAP. I understand some people don't use agents, I want to use mine.

I have 2 questions. If a realtor charges 5% to split, and there is only one agent, who gets the other half? 

 Has anyone ever had a deal with their agent that was different than a typical 5% since we buy multiple properties? Maybe a flat fee if it's a property I find which requires the buyer to pay the agent fee? 

I feel bad bringing this up with my agent but I don't want to spend all this money on the 2 homes that fell in my lap, when I am already paying a normal percentage from the auction I found. I am hoping to find a fair solution I can bring to her. 

Thanks for your advice!