The longer they make the list, the more likely they will see that it could not ever be completed. No particular incentive except possibly sympathy. They certainly could have purchased the land from private owners, but they probably chose not to because this would have been more costly to them. The value that anyone who uses lumber attaches to that product. The market value of the doctor's time is greater.
Value is subjective, so it is difficult to compare peoples' evaluations.
The value of someone's time is the value to that person of what they could do at that particular time . The political process can ignore them to accomplish what appear to be worthy goals. But thinking economically makes it possible to trace many of the hidden costs of government policies and reveal that they typically exceed the advertised benefits. The resulting breakdown in social cooperation is often used to justify even further intervention by government. Government should turn as many decisions as possible back to the people to make through the means of voluntary transactions.