They can be fun, but I think we do need to be in the habit of asking ourselves why some questions have been asked.
We would be instantly suspicious if, for instance, someone posted that they would love to take a trusting, unchipped, un-neutered, pedigree dog out for walks in your area while its owner is at work, please answer privately to a PO box, but if they missed out the details about what would make such a dog so attractive to them, and just offered the service, with the contact number an equally anonymous GN username, would you be as likely to believe that they had an ulterior motive and were likely to vanish with your pet?
People who are collecting information on whose house is ripe for burglary are not going to ask a straight question about what security you have, and whether you keep your tiara in the safe or on the dressing table.. They find out by asking other questions.