Stories like this make me want to do a complete check of a hotel room in Korea for these spy cameras:

Two men who installed miniature spy cameras in 30 motels and live-streamed footage of around 1,600 guests were arrested, police announced Wednesday. 

Since August last year, a 50-year-old man surnamed Park and a 48-year-old man surnamed Kim installed spy cameras in 42 rooms in 30 motels located in 10 cities throughout the country.

The diameter of the camera lenses was smaller than 1 millimeter (0.04 inches), and the two men installed them in parts of TVs, power sockets and even in the hangers for hair dryers that hang on the wall in bathrooms.

Each camera had a wireless function that allowed the men to upload online videos taken on the camera to various websites.

The lives of around 1,600 guests in these motel rooms were streamed live on a pornography website that Kim ran on an overseas server.

Park and Kim made users pay for the videos on the website, and they made some 7 million won in total ($6,197) from 97 members.

Joong Ang Ilbo

You can read more at the link, but it seems like this is a small payoff considering the expense and work that went into installing the cameras.