TVMs being everywhere is great but once they get vandalised they are out of action for a long time. And then there's the risk of them getting busted again
The problem with inconsistency is where ticketing facilities
are available, not where they are not available. There's no inconsistency if there's no TVM or someone's put a brick through it; you buy on the train or at the other end as the RPIs know the TVM is knackered at that station.
The problem with Northern in particular is that they're not providing sufficient TVMs
and they're trying to sting people for it. Look at the number of people who are getting Penalty Fakes because they didn't stop at a ticket office at the interchange station, or where the RPI doesn't believe they got on at that station (not that I blame the RPIs, given the number of short-faring stories we see on here).
My experience of Northern (and of London Midland, for that matter) is the same as Mojo's. The guards, presumably for the sake of a quiet life, will sell a person a ticket even where they've walked past a ticket office. I think that's the most sensible course of action.
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But if you are 100% sure that the ticket office was open, the staff hadn't gone away to deal with something (like assist a disabled person or deal with trouble makers) and saw that person arrive at the station actively avoiding the ticket office then it's a different matter.
I see it regularly at Shipley. The ticket office is over on platform 3, which is a very long walk from platform 1 (the main platform for Leeds). Guards will cheerfully sell discounted tickets to anyone getting on at Shipley without a ticket.
I'm sure occasionally the ticket office window is closed due to staff shortages, etc, but on every occasion? I doubt it.