I have been giving this very thing a lot of thought lately. I have come to the conclusion that we ALL take advantage of other people. If you work for someone for a wage you take advantage of their need for help in their business. Your doctor takes advantage of your need for good health, the grocer your hunger, a mechanic your broken car, the farmer supplies the grocer, the handyman (me) fixes the house you can't, won't do your self. And finally when your time is up the morticians take advantage of the need to inter your remains. We all need each other for something. The real estate invester takes the property off your hands that apparently no body else wanted that bad yet. Is that unfair? I don't think so. You might suggest that if you gave what your dad thinks is a fair price for your investsments, you likely would soon be asking if your old room is still empty. I'm not trying to say be mean to him. It is just if your going to take a risk of buying a property on speculation, then you better have some room in the deal for the unexpected. Try explaining the deal from the end buyer you hope to sell to back to the person you bought from. If you pay too much you HAVE to sell for too much or go out of business. Or run for congress.