When we bought our property, I didn't want a survey, and I made sure no one did a survey.
I wanted it to build a house on. We had 39.6 acres of sloped land with lots of trees, most scrub, some nice ones. Uphill from us we have a 1/4 mile long boundary with BLM land.
Now we needed 40 acres to build a house, and the country said 39.6 was "good enough" so we got our permit and built.
Now I had heard rumors that the old survey was somehow off, and there wasn't really as much acreage as claimed. While it would have been nice to know the exact boundaries, I kept thinking: "Why should I pay someone thousands of $ to get an answer which might be really bad?" I am pretty sure that if I proved I only had 35 acres, I couldn't have built the house and would have had a big lawsuit with the seller. All I really needed was a deed which said I owned enough land to build and I already had that.
Someday in the future, if the laws ever change and I can carve off 5 acres and sell it for a homesite, I will get a survey.
Right now, I am pretty certain that one neighbor has encroached about 3 or 4 feet with a 40' section of seldom-used dirt road. He is a pretty good guy, and why would I want to get into an expensive dispute over 400 square feet when I own millions of square feet? We trade tools, implements, work, and good times. I have hunted with him and his friends for the past 4 years, and they are now my friends too.
There is a lot more to country living than exerting control over every square inch of your land. In the city, where your lot might be 6000 square feet, a few hundred of those is enough to get excited over. 40 acres is 1,742,400 square feet. If someone takes a few hundred off, does it really matter?