Her decision to leave the company proved to be an 'expensive' mistake. [=a mistake that caused her to lose a lot of money]
They live in an 'expensive' neighborhood. [=a neighborhood in which houses, apartments, etc., cost a lot to buy or rent]
an 'expensive' shop [=a shop that sells expensive things]
(..) Jobs, Dell. All dropped out of college. Silicon Valley is the cradle of innovation because of drop outs. College... has become a cruel expensive joke on the poor and the middle class that benefits only the perpetrators of it. - The bloated administrators. - You are a dangerous man, (..)2014 TvShow: Silicon Valley Title: Minimum Viable Product Season: 1 Episode 1
(..) only achieve greatness Erlich is gonna kick me out. And I can't afford to pay rent here. It's insane. $ a month, $ a month... With five people. Jesus! Why is it so expensive here? Look at this place, it's a shithole. Uh-oh. Here's another one. Miss Palo Alto, K. There she goes. (..)2014 TvShow: Silicon Valley Title: Minimum Viable Product Season: 1 Episode 1