My pet theory is that historically most people went down from Dublin on Fridays and returned on Sundays - civil servants/students and the like. These would be traditional rail users. They would not get great value from seasonal tickets, they are not commuters.
Up till 8/9 years ago commuting wouldnt really exist beyond DART, Maynooth, Balbriggan, Greystones, Nass. I'd say that the fares matrix is based on this foundation and that it is adapted bit by bit when a service is tweaked and results in the nuttiness we see now.
Zonal system sorts it out.
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