Why would you (do something)?

When someone asks "Why would you ___?" they usually don't want an answer. It's not really a question; it's a criticism. It means "You shouldn't ___!" For example:

Why would you invite someone out to lunch and then expect them to pay for it?

Why would you spend money on a new pair of headphones when you already have a pair sitting unopened at home?

This phrase appears in these lessons: