US 1943 - 1945 Army/Navy Censor Covers?

Does anyone collect the Censor stamps or covers?

Examples...



And....

Very much so and not just the WW2 ones like the ones you show. People collect the WW1 ones as well. They also collect the civilian censored covers from during the wars and the censored covers from all of the other countries as well. On any given week there are a couple of thousand auctions going on ebay just for the US ones from WW2. The prices are all over the place according to rarity and importance and location and auxiliary markings and what kind of units and what ships and whether they are POW marked and how clearly markings are applied, etc. The common ones go for $1 to $2 while the rarer ones can go for more. There are reference books for this collecting area as well if you want to start collecting. It is a fascinating area for collecting and you will never run out of interesting new material that is being offered so you may want to narrow down your collecting to one specific branch of the armed forces or one specific theater of operations or whatever you like.
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Try the Military Postal Society too.

There are a growing number of books on military and civilian mail operations during WWII. Most deal with the censor marks only in passing. This book has an overview of worldwide censorship during WWII with hundreds of illustrations.

Thanks John and Kimo, I wasn't going to collect them, I have just purchased a lot of stamps and around a hundred were in the box, and didn't know what to do with them!
I don't really want to sell them on ebay, I would prefer to swap them so they go to a caring home, and a lot are in very average condition!