Not having a go at you but out here in the sticks some sellers will be between a rock and a hard place. Nearest PO is 4 miles away which isn't bad when you consider how far some people have to travel to get to actual PO, but isn't on a direct bus. Nearest PO on a direct bus is 7 miles away. So a courier who collects from house (especially if you have infirmity etc) can seem more attractive, at least intially.
I've seen sellers inluded the description like 'I can only post Weds and Sat' or somesuch. No idea if buyers are sympathetic when they give feedback - I suspect not all are.
When I was a seller (not sold for about 5 years now) I never failed to post either the day it was paid for, or next working day, and sent buyers updates, yet still some scrotes don't give you a 5 when answering the question 'how quickly did seller dispatch item?'