Not Fair!

Maybe I mean too fair. Here's how this restaurant charges for their house wine. A clear bottle with markings for each increment. 

- un peu (18cl)

- beaucoup (25cl)

- passionement (50cl)

- a la folie (75cl)

I don't know how they charge for amounts between the lines but just in case it's rounded to the greater amount, once I pass beaucoup I'm going straight for passionement!