What are a full year of 1925 National Geographic Magazines worth?

According to various online sources the prices of full year 1925 National Geographic magazines can vary widely, depending on the condition and whether they have been bound.

Loose single issues range from about $10 to $50 each.

A partially bound set (issues bound in two volumes) can sell for anywhere from $500 to $1,500.

A fully professionally bound set of 12 issues from 1925 in two volumes can fetch anywhere from $2,000 to $4,000 or even higher if the set is in exceptional condition or if it contains particularly desirable articles or photographs.