It's soaps.
Everyone has a crack at working in the shop / laudrette / supermarket / pub - any/all, and everyone marries or sleeps with everyone else.
As I have said many times - any and every soap collapses under even the most rudimentary analysis.
For EastEnders, it's always - how did so many deeply unpleasant people manage to populate such a small area, and why on earth do they suffer each other day after day?
For Coronation Sreet, it's why does Carla have to put up with a dummy like Peter when in 'real life', a woman as gorgeous as that would have men queuing from Manchster to London and back to take her out and treat her nicely.