I have two de-thatcher's that we break out twice a year. Once now, and another durring over-seeding. They cost me each about $2k, 10 years ago! They both still start on one pull and have made me more money than I would have thought. When a potential customer calls and ask's if I do this, they are surprised when I say "yes". They are an expensive investment, especially when you may not use them. But well worth the money, and you will never have to rent another. I usually charge $175 for an average yard. That includes de-thatching, and fertilizer as well taking all debris away.