As the viewer will be used in common indoor public places, such as cafes, pubs, phoneboxes, etc. it will be coin operated. This is because other forms of relaxation/entertainment in these environments - food, drinks, gambling - don't come for free. This form of escape would be very lucrative in the future, when the majority of people will not have left a city in their whole lives & will want something new & not man made.
A bit ironic as they will be seeing something completely natural through an artificial eye.
Anyway, I have received a piece of code allowing me to simulate the inserting money experience.
All I need to do now is make the mechanism & collection container to carry this function out.