AMEN CN27! Safety is not a problem that gets better the more money you throw at it. I've only been in one instance where I REALLY wanted tethers. Funny thing was I didn't have any. I did have a couple U-bolts, some line, a couple carabiners and a drill on board though. For exactly $0, and a few bowlines and drilled holes later, I made up tethers and jacklines for my crew and I. We clipped in and stayed on board.
Now if I had been of more experience I would never have been sailing in that gale in the first place. I agree about your weather forecast being one of your best pieces of sailing equipment.
"True, your boat will outperform mine to windward, but my boat will always outperform yours at anchor." --MedSailor