Pre-purchase inspection work often runs to someone else's timetable. There is an auction date, a cooling-off period or a settlement to plan around, and the search usually starts on a phone with a suburb in mind.
At that point people want to know quickly whether you cover the area, when you can attend and how soon the report will arrive. Making those answers easy to find matters as much as the ad itself. Many enquiries come through as calls, so call tracking is part of the setup from the start.