Paul Corfield wrote in
:

Yes I can. There should be no perceived benefit from not validating.
SNIP

Well, for people not using zones further than 5, or within 1, would
certainly be dissuaded from not validating, as their ordinary cap would be
lower than £6.20

And they'd still be charged (albeit cappable) £4 for their incomplete
journey, which would be more than most single journeys, so it would
dissuade those only wishing to do one journey.

In fact, the ONLY ones who would see no difference would be those living in
zone 6 and going to zone 1 and back.