There are different limits for different classes of fares. Before the last fare increase, the Dublin area band B fare was €1.50 single, €2.60 day return, €7.80 3-day, and €12.60 7-day. The new maximum fares are €1.65, €2.80, €8.60, and €14 respectively. So unless you're making multiple journeys a day or splitting your journey, the 3-day ticket in that fare band is a bit pointless. The phenomenon is unique to that band; the others all give some amount of discount for a 3-day ticket instead of 3 day returns.
In your own situation do bear in mind that the 7-day tickets for inside the short hop area are seven days, which can be any seven days. Get one on Tuesday and it's valid up to and including the following Monday. (Outside the short hop area 7-day tickets have to be Sunday to Saturday. Who knows why?)
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