buyers agent wants a commission for bringing in buyer?

[Ryan Nelson]

I put my home us FSBO a week ago, broker asked if I was open to working with her if she had buyer, I said yes, but wasn't taking on a sellers agent. The agent came the next day with the buyers and I spent a couple hours going through the house with them. The next day they made an offer. This was my fourth offer and so far this is the best (only been a week). The realtor then wrote in 3% sellers commission...(on top of the 6% sellers concession) for me to give her??? Doesn't that defeat the process of selling it myself? Also, isn't this against the buyers best interest since it no longer makes it the best offer?