LOL! I had to go back and look what you were talking about. I had forgotten all about it.
Here's a question along those same lines... why on earth would an oil company spend over a billion dollars the build a Spar when a FPSO can do the job?
That makes no sense to me, and its why I assumed a Spar could hange more volume than a FPSO in my original post that ruffled your feathers. Shame on me for not looking into it further.