Agents just think of it sometimes as that hard question nobody wants to ask. It's personal, too. Plus, they might not want to hear the answer. I think that's why some agents say, Sure, I'll show you that house. Meet you there in 10 minutes. Without a moment's hesitation. Then, they show up and the buyer says, "Hey, I thought you were the listing agent. Thanks for driving over here for nothing."
So the agent slaps her head, blaming herself: darn, if I had just asked the stupid question I could have avoided this. But the problem is the way an agent asks the question. Nobody should ever ask: are you working with an agent? That is a set up for direct failure. There is a better question to ask that serves the same purpose.
You can read more in my personal blog today at this link: Sacramento Agents Should Never Ask if a Home Buyer Has an Agent.