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That higher density makes waves far more destructive than wind, and that makes wave machines more costly to build. Then you get to the higther maintenance costs.
Yeah....that transocean rig has VERY low maintanance cost......not that its sitting at the bottom of the ocean. LOL!!!
And leaving a leak behind for months that will cost hundreds of billions to clean up. Add to that a few billions lost on the fishing and tourism industry along with the environmental impact.