In message .com, XmaX
writes

I didn't say that I am definitely doing it, I just asked for some
advice whether it works and how risky is it. I travel in the Tube for
2 months and never saw a ticket inspector, so I assumed there aren't
many of them. Or It probably means that I am lucky

It's nothing to do with being 'lucky' as you put it - it's you
(apparently, seriously) considering making a positive decision to steal
from/defraud the rest of the fare paying passengers.

It's not really worth getting a Z1234 travelcard, as I spend roughly 5
a day for 5 days, which gives me 25 pounds, nearly 10 less than a
Z1234 travelcard, but 6 more than Z234, not to mention that I have
bigger flexibility.

It's worth the correct fare for the journey. You are offered to be
carried at a rate. If you think that rate is not appropriate, don't use
it - just make your own, alternative arrangements. Don't expect anyone
on here to 'approve' your attempted avoidance tactics of the correct
fare to be paid.

By all means consider the legitimate (Oyster pre-pay perhaps) options to
pay less, but as I said earlier, don't come crying to us if you attempt
to defraud and you then get caught out (as others have done recently).

Also, I just checked - there are no travelcards in DLR ticket machines
(or at least in Bow Church) - only one day travelcards, nothing more
than that.

And advertising the fact on here that you are considering avoiding
paying the correct fare is hardly a good move either.
--
Steve Fitzgerald has now left the building.
You will find him in London's Docklands, E16, UK
(please use the reply to address for email)