Maddy Logelin points at a photo on the wall and says "mama." Of course, she does that with every photo, said her father, Matt Logelin.

Real estate agents harbor a wealth of information and can help you to pick a sales price for your home. Sometimes, when I walk into a seller's home to talk about listing it, I can tell right off the bat whether that seller has a firm sales price in mind. Without exception, they almost always have a...