Selling our primary home, dual agent offer received.

[Tony Kim]

Hello we are currently selling our primary home and we just had an open house last weekend. We received an offer on Tuesday, but it's a dual agent situation. I.e., our listing agent is also representing the buyer. 

Is this something I should be concerned about? I honestly don't see how our agent can still act in the same unbiased manner and represent solely our interests when an additional 75k or so is at stake for her if we accept this offer. Or am I being too paranoid? Our agent is saying that sometimes folks come to open houses without an agent and will accept being their agent if they request it. I know that's true, but do people looking at homes in our price range really not have an agent they are working with?  What is the industry standard for best practices in this situation? 

Thanks!