1) Yes, but that’s not a fair reason in my opinion. For example, people travelling from let’s say Dalston via Shoreditch to Shadwell, continuing east via DLR, get overcharged.
2) Interesting, but that means very expensive fares for the Cheshunt branch… :/
3) What do you mean please? 😀 If you compare Watford HS & Jcn with other lines, they lie in the middle of zone 7.
4) Seen already… 😉