Keeping up the shark population is a big deal... Sharks going extinct would impact the ocean greatly and would be like like a big aquarium loosing its main scavengers that help regulate and keep the water clean. Plus, with sharks being on top of the food chain, it would definitely impact other populations and would cause problems with their decline in numbers. For example, In Australia, one lobster fishery is threatened because the declining number of sharks cannot control the lobster eating octopuses.
Personally, I wish people would leave the sharks alone... Perhaps some of those rich gluts can find something else to eat besides shark fin soup?