Why would you assume that someone will work on solving the puzzle only for karma? Curiosity, challenge and fun are also valid reasons, and I can see that a lot

Why would you assume that someone will work on solving the puzzle only for karma? Curiosity, challenge and fun are also valid reasons, and I can see that a lot of people got curious about the message, and some of them took the challenge and had a good fun solving it, and maybe trolling the OP after that.