It's hard to say whether this is a good deal or not, the Oirish website is a nightmare to navigate for season ticket info. What is to stop someone taking out a Subscription ticket for only the months the season is active and thereby buy a ticket and Season ticket holders rights for less than the cost of a season ticket? Only downside seems to be you don't get an allocated seat, just a guaranteed ticket in your class. Won't this encourage Season ticket holders to stop being Season ticket holders?
A Gold Season ticket seems to be £525 for an adult, a Gold subscription is £45/month for an adult. You aren't gonna keep it running in Jul and Aug so isn't that £450 for the year? Or am I missing something obvious?