These are the SAK equivalent of blood diamonds! I'm sure nobody took up smoking just to win a Marlboro penknife, but I am sure a lot of second hand Marlboro SAKs are second hand because the original owner croaked prematurely.
Definitely worth keeping the logo cos these are interesting SAKs - not just because of their unique toolsets, but also in terms of marketing, morality, and mortality! Someone might have died for that SAK!