Unfortunately, Ken Ring is not so easily dismissed. He isn't any worse at seasonal prediction than NIWA and he does have a mechanism for his forecasts, atmospheric tides. Whether (oops, sorry) this has any traction, I don't have any idea.
His forecasts are not vague, btw, but very specific with temperature, wind and precipitation. His almanac includes isobaric maps relating to the forecasts.
I do know that a friend of mine blew thousands using his almanac to structure his farm programme one growing season. Epic fail.
There was a tidal theory of avalanche forecasting put forward in the early 80's that didn't sweep the industry, although some programmes find that high tides do assist with slab propogation with explosives.
If I find his 2011 almanac on sale or in the library, I might track it over the year. Being an outside kind of kiwi, I love weather and Jim Hickey is my hero.