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Why are residential investment properties owned by non-professional investors and not large corporations?
Your experience is anecdotal (outside Australia things are different). There are many companies and real estate investment trusts (REITs) that own residential properties (as well as commercial in many cases to have a balanced portfolio). They are probably more common in higher-density housing like condos, apartment buildings, flats, or whatever you like to call them, but they are certainly part of the market for single family units in the suburbs as well. What follows is all my own opinion. I have managed and rented a couple of properties that I had lived in but wasn't ready to sell yet when I moved out. In most cases, I wish I would have sold sooner, rather than renting them out. I think that there are easier/less risky ways to get a good return on your money. Sometimes the market isn't robust enough to quickly sell when it's time to move, and some people like the flexibility of having a property that a child could occupy instead of moving back in at home. I understand those points of view even if I disagree with them.