Maybe you'd know, why do 3D glasses need such a thick frame ? Couldn't they be made lighter and more comfortable with thinner framework?
I think they're targeting the "fashion conscious" crowd. The functional cardboard frame glasses just don't seem to appeal to anyone anymore....
As to cost, we are targeting narrow markets where it makes sense to use 3D and where content can be easily converted to 3D. I spend my time in education, others target medical and engineering.
The cost of content is the big stumbling block for business.
For consumers, some folks have disposable income to play their XBox in 3D, others that are looking for a new TV (and want a really big TV) have purchased a Mitsubishi or a one of these new ones.
In 5 years 3D will be just another option, and as technology improves will be in homes in 10 years.