On May 6, 12:59 pm, "Paul Scott"
wrote:
If it was spite the tube fare would presumably have a standard offset
between Oyster and 'Cash'. In fact the further you go the difference reduces
until it's only 50p, because the £4.00 gets you all the way from zone 1 to
zone 6, a point that seems lost in the noise...

If its not by spite then what is the purpose exactly? Faster boarding
times hardly apply to the tube - you don't pay on the train!

B2003