The good news for need-to-always-be-even-more-shocked-and-yet-more-appalled columnists is that the Yarmouth ferry is the gift that keeps on giving. The bad news for taxpayers is that it is also the ferry that keeps on taking. I’ve been writing about the always-sinking-but-never-finally-sunk ferry service between Yarmouth and assorted ports in Maine since at least 2007. “Ferry Bad…