Where I live (a rural area) almost no one does surveys as well. This was shocking to me! But then, when we wanted to put a fence up and called a surveyor, we found out why.
The backside of our property goes straight downhill and can't be seen. It probably COULD be reached, but not by us anyway! The surveyor quoted us a starting price of $4000, and said he couldn't guarantee that price wouldn't go up. We talked to our neighbors, and they said they went through the same thing when they bought their property. So, in the end, we both took our house plots and agreed on a spot between which we would call the property line.
This was scary to me, but...better than $4000. I figure if I have to take down the fence later, it still won't cost me that much.
One thing to think about is will there be any problems if you decide to sell. If a buyer wants a survey and it is found someone encroached the property they may want to back out or ask for a lower price.