Contractors will make limited money on basic repair work for investors due to price competition, but can increase earnings by offering value-add services (e.g., adding square footage, unique features) that significantly boost property value.
"you're only going to make so much money on that type of work and the investor is always going to come and try to beat you up on the price... if you can learn for those types of things that make a house worth more... I think you can talk people into spending more money on their remodels if you're really good."