Setting pins is easy; if that was all there is to it, anybody could be a surveyor. It’s all of the research of not only the lot in question but all of the abuttors. When the cost goes up is if the description has been copied and recopied for 150 years and still says “ by the land of Smith to a pine stump; thence in a westerly direction to where the old cow lies down in the afternoon”... giving no tangible bearing or distance. They need to recover time spent working up estimates for jobs, only to have Joe decide that it’s too much. Or when Farmer Jones had a 100 acre tract, and sold five 30 acres lots off it back in 1963; those are times when the science becomes an art. They also have liability insurance to pay for, and on occasion may even find themselves in court defending their work. Like any trade, all of those things affect what we pay.