The reason people (me at least) aren't hung up on ShaowFox selling covers, is that he is very open about where the covers come from, and he uses the small profits he makes from the printing service to tool new cases for the community.
OK, it comes down to the same thing, selling non owned intellectual property for profit, BUT, and it's a BIG BUT(T), Shenske has made every cover for the CGC NES, and has given permission for them all to be used (and I would assume received some form of payment) - still dubious legality, but meh, that's really not the issue. Very different to the leachers stripping the forum of covers, and selling without even a thankyou. That being said - I am fully aware that anything I post on the internet is out there for people to do anything they want with, it would be nice if people at least said thankyou if they are making money from something I put hours of work into. But please, let's not make this thread into a whine-fest about people selling covers - it happens - we just have to accept it.
As to the original post - I like the idea - I myself make inserts for all my Atari 2600 games to go inside box protector. They can be retooled into full boxes with virtually no effort. If anyone wants to see them, they are in my box account, in the 2600 folder.