First off... I find that this statement is half true and half opinionated. Let me back up a little, there are tons of people on this site that think you should not worry about the square footage of the turf, beds, or anything of the sorts. They also laugh when you mention the idea of tracking linear feet of beds (soft lines) and sidewalks-drives (hardlines). Those are probably the same people that can claim to drive up to a property and spit out a price from their front seat. Not bashing that philosophy, I just operate from a different school of thought. Having been trained by the big dawgs and used their formulas and seen how they account for everything they do... I like that mode of thinking. Every property I walk onto for a potential sale, I measure everything and sometimes take pictures. It allows me to see on paper and visually what I am actually bidding on and gives me a hard number to base my costs on. Every size mower takes a different time to cut a yard. (ie: patterns, obsticles, etc) Every operator of that machine has a different time for each yard. Heat, time of day, outside influences all effect their time. However, if you can develop an average "time" for each of those size mowers, it gives you a measuring tool at your disposal in which to bid with favorable accuracy. When you factor in your drive time, load and unload time, fuel costs, etc. all into that same bid sheet.... whoalla.... you have a bidding tool that will show you your costs for that "individual" property. That is what it is... a TOOL. Adjusting numbers or what not to get the job/sale is your call, but in my experience it is my best tool that I carry. All the big guys do this.... Brickman, TGLC, Valley Crest, US Lawns, ECI and so on. They must use it for some reason.