Covers With Multiple Canceled Stamps Related To A Single Theme...

I caught sight of a cover bearing German occupation stamps used in Belgium during WW I (http://www.ebay.com/itm/1916-18-Bel...Swc-tY2Ce1), and I wonder:

Why would anyone do this (aside from just having all the stamps on a single cover)? Is the cover any more valuable because it bears all of the occupation stamps? (To my way of thinking, the cover falls in a category between a "working" philatelically used cover and something that smells like "canceled to order."

Can anyone straighten me out, here? I'd appreciate it.

Cordially...

It is 100 percent philatelic. It appears to be cancelled to order as well. Just because there was a war going on there were still many stamp collectors avidly creating and collecting stamps. Some were soldiers and officers as well. In the case of this particular cover I might imagine that it had some propaganda value to the Germans as well - in that it shows they were in charge in Belgium at the time it was created.

As for it having any extra value because it has all of the stamps on it that is a matter for someone who collects these stamps. As a piece of postal history the value is minimal, the value is mainly in the stamps themselves though some collectors want stamps that actually were used in a postally valid way and not CTOs in order to have value as used stamps.

For both WWI and WWII German occupation issues, there are so many philatelic souvenir covers. In addition to the complete sets on cover, there are many covers with provisional cancels which were obviously commissioned by dealers or collectors to be returned to them. IMHO, most of the stamps of The protectorate of Bohemia and Moravia, for example, are creations for collectors in the German homeland.