Did they increase by 50% in one go when the service increased?
I don't want to derail the topic by going off onto season ticket prices because we get into the complexities of different inflation measures which really is another topic, and I fully concede/am aware that the picture is more complex than my somewhat facetious comment.
It is worth emphasising that the extra TPE service up beyond York wasn't a 50% increase in services along the line - it was one extra service on the 5tph. So your framing of the question actually gets to the point of my grumble really: the post-Covid service changes seem to have been done in very unsystematic ways, with little coordination across TOCs. There are good operational reasons for both TPE and XC to cut back on the number of through routes, to improve reliability and/or train length. The problem is the
both doing that together results in a very substantial cut in services - just a couple of years after Northern were told they couldn't run their Middlesbrough - Carlisle services up the ECML due to overcrowding.
Aware that there is this promised re-drawing of the timetable coming, but while the date for that is missing it feels like we are being strung along with a worse service, given that the noises are that XC won't be reinstating their other hourly train either. Given that we are on an exit trajectory from the pandemic, it's hard to see now why the service in May 2022 should be 33% less than in May 2019.