You left out "the price of the materials" such as the oil based resin that is used.. Weight!! I will try and put together some comparison weights down the road.. I have some old figures that I will update. The size is not only a height and a base measurement but also a cubic inch thing. 3 X 3 is 9 and 5 X 5 is 25.. There are other material factors that go into cost to produce..

The price of little lights has gone up on average about 25% over the past 3 or 4 years, if you raise the cost of a limited edition of $70 (using your figure) by 25%, it would now cost $87.50..

Right now I can't even get to a lot of my lighthouses since we are totally redoing our bedroom, bedroom closets and both bathrooms and our great room is filled with clothes racks etc.. Plus I need to get a new power supply cord for my postal scale (1 of 4 cats chewed it).

I will post the information in the Numbers Game Forum where this discussion probably fits a little better..