Sharks are not similar to tigers in that you can't (with current technology?) keep some types of them alive in captivity, but tigers you can. Legalizing eating tiger meat, though, without also legalizing tiger ranches (?) would not be of help in preventing extinction.
r/Fitness does a weekly "Moronic Monday", a judgment-free thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. I thought this seemed like a useful thing to have here - after all, the concepts discussed on LessWrong are probably at least a little harder to grasp than those of weightlifting. Plus, I have a few stupid questions of my own, so it doesn't seem unreasonable that other people might as well.