The mistake Harbour Lights made with the Navesink was that they did not lower the production amount.
Harbour Lights was planning on a smaller special edition of 6500 for Navesink, but got talked out of it by the Reps.

HL learned from this mistake. More expensive lights are harder to sell. The lower production also adds spice to the pot and will help sell the Sankaty. I think this will sell in the north but I can't see a big demand for this light in the South, except for those that want something different, or collects them all. It has caught my eye and I may buy this one even though it is not in my region

I think most lighthouse collectors now only collect their regions or lights they have seen. So to sell to the rest of the collectors HL has to spice up the light to attract collectors out of their normal collecting area.