Even the Ormskirk line has *some* filling up towards Ormskirk, though most of this is from Town Green and Aughton Park, and mostly school traffic (which is considerable but peaky; there are no school buses from Aughton, the railway is paid to carry the traffic instead) and older people (many of whom will have switched to bus as it's free and runs a bit of a loop of Aughton so is more door-to-door). And for Kirkby the demand is mostly "all the way" anyway.
Maghull North has changed the basis of this, but I did long wonder why half the trains didn't turn back at Maghull as that's when things start getting really busy - I haven't checked but I'd be surprised if Maghull wasn't the busiest station on the branch. This is very different from the other branch that goes outside the PTE area (Chester, so back on topic) because Hooton, the boundary station, is basically in the middle of a field.