It's hard to say how much anything actually costs in aviation because no one pays list price and are outfitted per the buyers' specs (why airlines all have their own in cabin look). Discounts are usually north of 50% off "list". Economy style seats don't have a lot going on and definitely don't cost the same as a Lambo.

You can even buy your own if you want to be uncomfortable in your own home:

http://usedairlineseats.com/product/set-of-coach-class-tripl...