Counter-stamped quarters: Is there any interest in them?

What is the general opinion in coin collecting about the quarters counter-stamped by Daniel Carr with his own initials? Do these have any collecting appeal or is there little interest since the stamps happened after the coins were minted? Are the stamps considered damage to the coin?

 

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I didn't even know they existed
Too many collectors that type of alteration is considered damage

 

To me it’s a modern cent so no extra value.

 

Agree.
I have many!

 

My point exactly and they all appear to be on the State Quarters.

 

I'd say most collectors consider it damage, but Dan Carr fans might have interest I guess. It's along the lines of the QuarterMaster items posted above or the quirky things counterstamped on Lincoln cents etc, but it's more like the self-promotion stuff stores used to do.