Then don't use it, again if merchants want to waste their voodoo to sink a ship rather than re-take it so be it. They'll run out.
If they want to re-take it... it will still cost them more as most pirates run few ships and can make it very difficult.
There are many benefits for pirates if this goes through. It is really to bad the majority lack the foresight to see this. I have already created many scenarios to work this in my advantage..
And yes chin.. I worked them around using minimal voodoo so any pirate could do so if they were creative enough to come up with the ideas
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Learn to "adapt" and think outside the box, that's what makes one great!