Sometimes you read a restaurant menu and look at the prices and think, "Fsh, I could make that just as well at home for a tenth of the cost!"
And then other times you look up recipes and think, "Wow, um, I'm happy to pay someone else to make that for me because I can't be bothered to do all of that and/or don't have all of the tools."
I totally just had the latter in looking up how to cook Chinese-restaurant-style roast duck. It's not that I couldn't follow the recipes I found so much as I don't wanna. I'll let someone else cook that for me whenever I feel like having it.
I cannot, however, generally abide paying multiple dollars/pounds for a slice of chocolate cake because a) 99% of the time I'm disappointed in the weak chocolate flavour and b) I can make an entire really good, really dense, really chocolatey cake for a few dollars/pounds.
For the record, this is my new favourite cake recipe because it's crazy-easy (as in, I thought the directions were wrong when I first read it, but it totally works): http://www.bbc.co.uk/food/recipes/easy_chocolate_cake_31070
So what are the foods you won't pay for versus the ones you can't be bothered to cook for yourself?