[jbert]

People want to try on several pairs of glasses and see which ones they look best in.

So if you control the retail chain, you've got the monopoly.

They said their competition was walmart. And that they bought Oakley after refusing to stock their product.

[josu]

I think that it has more to do with "which ones they look best in". Luxotica, somehow, seems to decide which ones look best.