When the buying stops, the practice stops. I'm against sharks fin and animal fur mainly because of the cruelty involved. Cats and dogs are skinned alive and fully conscious, and sharks have their fins chopped off and thrown back into the sea to bleed to death, or be attacked by their own kind.
Its unquestionable cruelty that prompts me to stand against it. I admit I like sharksfin, but its fake sharksfin I like, and its actually quite nice. I do believe some animals are there for our consumption, but we have no right to torture them or inflict pain on them in the process.
And you know what they say, now an animal abuser, later an abuser of fellow human beings. If someone abuses animals, he/she is almost certain to become abusive to his/her fellow human beings. I voted the last option, and I am really glad it has the highest number of votes. It shows that people do have hearts, and that people who find joy in inflicting pain and suffering are still a minority.