There are some markets where people do this, so the opportunity is small, e.g., there seem to be ~5 people who do this with office furniture locally, so you have to be very fast to get a deal, but few classes of goods have enough people doing it to eliminate amazing deals, e.g., a friend of mine does this with cars and is basically permanently renting a car that makes him money.
Based on the profit and the number of opportunities, he could make a living doing this, but he just does it for fun.