Arrived in Dublin airport and wanted to get the 747 to town. Queue for all two ticket machines was very long. Then Dublin Bus customer service muppet(i.e. the guy wearing a high visibility jacket labelled "Dublin Bus - Customer Service) tells us that one machine "must be down" but that it has nothing to do with him - after all he must work for a different Dublin Bus ...
So one machine to serve all intending passengers. Of course you can buy an inflated price single on the bus assuming you have exact change.
I voted with my feet and got the Aircoach instead .