I think it is that people are too big of pussies to tell you the truth. They don't have the balls to be honest and tell you, "I am not interested", or "I can't afford it" or "I changed my mind" (what little there is of it)...
They think that they look better stringing you along and playing the "I'll call you later" game.
Or some people just think that it is not "politically correct" to tell you the truth that they do not even intend to call you back.
Also, keep in mind that "common sense" is not common any more... Sad...
Also respecting other's property has gone also. When we grew up you were taught to respect others property and treat it better than if it were yours. Now it's the "if I can't have one myself, I will ruin/break/damage his..." Their jealous *** thinks that if they can't have one, nobody else deserves it also.