Why should a public good (being safely housed) be an investment vehicle for someone to make money at low risk and low rates of taxation, whilst not contributing anything significant back into the economy?
If someone needs a large house, but can't afford it (say a blended family where grandparents have had to move in due to care needs, or a young couple who unexpectedly had triplets) why should they be expected have to make do with unsuitable accommodation in order to allow someone substantially better off than themselves to turn a profit?
Fundimentally the question we have to answer as a society is do we value making money as being above human dignity?