IPhone 4 SLR Mount lets you shoot 5-megapixel photos with your $3,000 lens

It's fun to read about, but I can't help wondering what is really the idea behind that.

I mean, someone invested money to design and manufacture this addon. In an objective to sell it.

But who would buy that? What exactly is the target market for that product, which is far from cheap (canceling all impulse or 'fun' sales)

People with such lens most likely have at least a bit of knowledge about photography and wouldn't take a quality photo with an iPhone. And uninformed people... they don't have such lens, they have small digital cameras or are satisfied with the iPhone as it is.

It's not really a matter of weight or carrying either: if you carry the lens, you might as well put the body in the bag.

So I remain puzzled.