What are you on about? I just went to the website. The only item at $20 on the main menu is a steak dish. The vast majority of it is $11-$15 and the lunch menu is sub $10. I didn't expect myself to be defending OG of all places but coooome oooooon.
Just looked at the dinner menu:
http://www.olivegarden.com/menu-listing/dinner#cucina-classica-classic-recipes
They probably do adjust prices locally, but where I am outside of Boston, every meat or fish entree on the menu is $15 - $20. Vegetarian/no-meat dishes are $12 to $15. There's only 1 meat dish less than $15, and that's Garlic Rosemary chicken which s $14.49. Their "Lasagna Classico" might also be $14.49 and I can't tell if that has ground beef in it or not.
So yeah, nearly every entree is $15 - $20.
A problem with Olive Garden is that they serve bad Italian food at prices slightly more expensive than other shitty chains. TGIFridays, Applebee's, etc., they're bad too, but they're generally not serving Italian food. Italian food is very cheap and easy to make at home if you're making it to the calibur of the Olive Garden. If you're getting burgers and fries at Applebees for $13 or chicken fried steak from Chili's for $15, I'm not as angry about it because those things aren't as easy to make at home as the Olive Garden's dog-food calibur Italian food.
The majority of all American chain restaurants serve bagged frozen meals that they heat in a microwave. Your Stuffed Chicken Marsala comes to the Olive Garden frozen, in a bag, with everything included... the sauce, mushrooms, everything else, frozen in a small bag along with 50 other Stuff Chicken Marsalas. When you order it, the line cook takes the bag out of the freezer, opens it, puts it in the microwave, heats it up, and puts it on a plate. They charge you $17 for this. now, this is also true of any pasta dish you get at Chili's or TGIFridays, it's all frozen in a bag, but Chili's and TGIFridays don't focus their menu around bagged, frozen food that's cooked in a microwave. At least if you get a burger at Chili's, it's actually grilled for you and made there.
*edit*
And don't be fooled by the photos of your pasta cobanara. This is what you'll get for your $15 except there will be previously frozen, microwaved chicken on it