I know someone who is house hunting. Their own house isn't on the market yet because they are worried about not finding what they want - a recipe for disappointment imo but I understand why. They saw something online they were interested in yesterday but have been told the vendor is only letting people view who have their houses on the market. When we were selling I'd have pulled anyone in off the street to look at my house. We certainly had ours on the market before we started looking but i understand why someone would want to hold back and think it is just daft not to let them have a look.