I am just sorry that no one gives a good answer - I would like to know also
What is a good answer?
The Bureau Precancel is difficult to find and with most things scarcity drives the price (in combination with demand). Additionally it has full gum, 3-NH, 1-VLH. Gum if wanted, is difficult to find on most precancels as it was normally soaked off as precanceled stamps are considered used. Plate blocks carry interest as well for some collectors. Bureau Precancels have varieties, "Styles" assigned numbers by the PSS. The "-71" indicates in which style the precancel was produced.
Now there also precancels which are quite expensive because the underlying stamp is quite rare and valuable. That is not the case here. (Image from eBay listing)
From the H.R. Harmer's lot 5097, sale 3021, October 13-15, 2016 description:
A NEARLY COMPLETE BUREAU PRECANCELS COLLECTION. neatly arranged in three volumes, many many 100s and missing most of the rare bureaus but does include many high values such as Inglewood, CA 1034-71
, Ventura, CA 804-71a (error block of 25), Fort Lauderdale, FL 804-73, New Orleans, LA J59-32, Oklahoma, OK 581-43, Wayne, PA 1615C-81, Columbia, SC 600-61 and Rock Hill, SC 1305-71 to name a few, incl copies of PSS Bureau and Town & Type catalogs....
Went unsold at at a start of $3000.00
From the PSS website, "With few exceptions (mainly rare US stamps such as Scott #596, or #544), the value of a precancel depends first on the town it comes from AND on the style of TYPE. Therefore one must learn how to identify types to be able to get started in the evaluation. This can take a LOT of study! In some cases (bureaus and classics mainly) the specific stamp enters into the evaluation process, but usually the stamp has nothing to do with the value."