But when it came to the final, which they lost to Tipperary after a second-half collapse, the spending plummeted.
Rebel County fans who travelled to the capital for the semi-final shelled out €920,000 on the first Sunday in July. But when their team succumbed to Tipperary in the final on July 20, their fans spent 13pc less, according to the AIB Spend Trend for last month.
In contrast, Tipperary fans flashed the cash when their team won the All-Ireland Senior Hurling Championship. The figures show the Tipperary fans spent 27pc more on the day their team claimed the Liam MacCarthy Cup than they had on the day of their semi-final win over Kilkenny on July 6.
Kerry may have won the Sam Maguire Cup, but Donegal fans spent 12pc more in Dublin than rival fans.
Across the economy, the AIB figures show spending last month was up 9pc on the same month last year.
Online spending has been growing more strongly. It was 14pc higher than in-store spending over the 12 months. The average in-store transaction was €28.80 compared with €96.90 for the average online transaction.
The grocery sector was one of few where in-store spending held up strongly. Spending was 6pc higher overall, with most of those purchases made in stores rather than online.
In contrast, spending on clothing rose just 1pc compared with the same month a year ago.
Department stores saw expenditure fall by 1pc in the 12 months to the end of last month.
July is traditionally peak tourist season, but the picture for the domestic hospitality sector was mixed.
Spending in pubs was down compared with July last year. The biggest falls in spending were recorded in Wicklow, Dublin and Clare.
The biggest increases were in Kerry, Donegal and Tipperary. These are all counties that were involved in All-Ireland Senior Championship finals.
Expenditure in restaurants was up 10pc and the amount of money spent in hotels was up 3pc.
The data was compiled from 78 million card transactions carried out by AIB customers in store and online last month and has been anonymised and aggregated.
Entertainment spending was up, partly driven by digital games, which were 34pc higher than 12 months ago. Health spending was also up. Car rental spending climbed 8pc.
Head of consumer at AIB Adrian Moynihan said the figures highlight the resilience of consumer confidence.
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