I think most posts here as some merit to it...
Victor like it was said earlier we dont very often get waayy clear water here, best viz I ever experienced on a dive was 30m and that was 5miles from the coast. Like Covert said good viz is 10 to 15m if your on a shore dive. Also most of our areas here can have sharks, thing is you never know when one mite be passing your area of diving.
About the attracting sharks issue, I spoke to a researcher and dive operator in Mosselbaai the other day and they say sharks in the area can feel the vibrations your spear makes when it leaves the gun. So if they can feel that then I dont really see how a pod will make a diverence...
Wear em proudly I say

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Dive safe and shoot straight
- Hénré -
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"Thinking is the hardest work there is, which is probably why so few engage in it"
- Henry Ford -