Why do they call?

So I am in the office and get a call on a rural property I have listed. People want to know how much, how big etc. Fine. I don't hide anything.

Then I offer to send them information on properties that suit their needs. They tell me their needs. I research a bit and e-mail or mail some listings. They call back with questions. I answer. We go look at property together a few times. And I never hear from them again.

That's fine too, I suppose. I don't expect every call to result in a sale. But I just wonder sometimes what people are thinking when the waste so much of their own time, weeks and months of blundering around the countryside only to finally decide not to buy anything. It's a hobby, I guess.