Ryanair are looking at the possibility of charging £1 to use the toilet on their flights. The customer would most likely argue that Ryanair is using its captive audience to exploit the customer and make a ‘fast buck’. Ryanair would argue that this helps to keep prices down and make air travel more affordable to all consumers.
A similar example of exploiting a captive audience could be excessive charging for cinema popcorn.
Again cinemas would argue that the rationale is that this enables them to keep the prices at a level which maximises the number of people who can afford to visit the cinema. If they were to reduce the price of popcorn and as result, slightly increase the cost of watching the film, this would price certain customers out of the cinema.