Ran out of credit on my prepay oyster this morning, so I was faced with
a 10 minute queue to one of 2 machines that can do topups at Oxford
Circus. Almost everyone else in the queue was topping up.

There were 8 unused cash ticket machines. What a waste of space, why
haven't the majority (or all) of these been converted to card/oyster
machines? Is it a deliberate decision to raise more money from those in
a rush?