Self-serving?
Hahaha, no you're wrong there – the self-serving ones are the people eating shark fin soup, and trying to defend the practice.
You did not reply to the above info; just pasted a comment.
So, how long have regular Chinese being eating shark fin soup? Not long at all.
Don't lump all Chinese together, either; there are people who are turning down shark fin soup as concerned about species' populations (and cruelty, just highlighted by SPCA here).
You're the one who hasn't considered the issue. Before "replying", try reading info and making a considered response.