Whatchutalkinaboutwillis? It's a general discussion about why people do it, for example if one bought a terraced house it would take many years for the rental income of said property to pay off the mortgage
Which ever way you buy the property, mortgage or cash, you are gambling on property prices increasing and rents being stable . I know a couple of people who came unstuck in the property crash of the late 80's, I bought my house off one of them
People with more money than they know what to do with trying to make more money than that and forcing property prices up higher than they should be.