Owning property for the purpose of renting it has serious negative effects on communities and society. Communities thrive when people live in them and value them, not when random people come for a few days, abuse the commons, and leave for somewhere else. If not banned, I'm all in favor of heavy regulation and taxation of investment properties, with a maximum number allocated as a percentage of the available housing. If renting becomes unpopular, people will actually have to sell and free up inventory, dropping prices.