As I keep saying, and several posters keep ignoring, those not
*familiar enough with London* to use Oyster.

Yes this is true. The system is not properly explained to users.
The signs above prepay validators in various locations with "Prepay
users must touch here" are totally baffling to everyone. Even staff
do not seem to have consistent knowledge about how it works.

The cost benefits are not properly communicated either. I think some
people cannot beleive that the "technological option" can be cheaper
than buying paper tickets. How many low paid workers using the tube
before 06:30 know they could be getting discounted fares by using
Oyster? How has this group been targetted with marketing? How
about people who do not have English as a first language?