Just finished thatching 4 lawns and it took 40, 39 gallon bags and completely filled my 16' trailer. I looked around on other threads and realized that I would be commiting financial suicide If I charged what others did. Here is what I have invested in this work. Rental walk behind thatcher$45 Bags $15 Landfill @1.80 per 100lbs haven't been but estimating or charging them as 100lb ea. so $72 Time 10 hours so far, 1 additional hour to landfill to dump (*1 additional hour spent seeding 3 lawns) approx 20 min ea. Fuel 40 miles @$.50/mi=$20 Total expense (variable expenses only)= $152 Figure I'm going to charge between $12 and $15 per bag. As for charging by the square footage, seems a little dumb since each yard has different amounts or thickness of thatch that were removed. For example, 2K yard had 5 bags removed. 14K had 22 bags. Let me know what you think. *Total revenue @$15/ea.=$600 profit $448 $44.80/hr. @$12/ea.=$480 profit $328 $32.80/hr. *Thatching revenue only Both suck, but were done starting Friday afternoon after everything else was finished so they were an added bonus.