Nice bit of false equivalence there though - the way you're framing it is there will be nobody to help you buy a ticket at Euston, whereas there will at Aughton Park - which isn't the case.
Avanti's own consultation document states there will be support available 0600 - 2200 6 days a week and 0700 - 2200 on Sunday, plus the station will be staffed 20+ hours a day - the only 'unstaffed' times are pretty limited.
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The issue with Merseyrail is a local issue - they're grandstanding by saying 'oh we won't close any ticket offices' - and no doubt Burnham will be trying something similar in Greater Manchester - the problem with both their positions is TFL have already closed all the ticket offices on the Underground - and the Merseyrail network serves much the same purpose that the Underground does. As ever, Merseyside is simply being a few decades behind the rest of the country.