The Agent Knows
It is not likely that a given agent is going to be able to preview every home for sale all over town because in a large city, this may involve visiting hundreds of homes as opposed to a relative handful in a given neighborhood or part of town. And the agents who work a specific location the most will often have shown many of the homes for sale several times, making them even more knowledgeable about each one. They will know which homes have the offensive wallpaper you do not like or that have the lovely landscaping you do want. They will know which homes are a genuine bargain and which ones are over priced. In other words, the local agent is better prepared to show you the homes that match your needs and desires.