Even the lenses. Both that and the frames only cost 3-15 dollars to make.
The mark- up in insane.
I know that must be true, because they have to make money. I just don’t understand how they could do it. You can’t mass produce prescription lenses cut for specific frames. They must use either some kind of very sophisticated machinery, or very cheap labor, which is not so easy because cutting lenses takes some degree of skill.
Also I don’t get why you think that’s insane. At the end of the day everyone is happy. Do you expect them to sell you glasses at cost?