I recently listened to a fascinating podcast from the Freakonomics series - they were describing the estate agent business (or, racket) in the USA. Both the buyer and seller are expected to engage estate agents who will split the fee paid by the seller which is usually around 6%.
If you try to sell or buy yourself without an agent, to save on fees, you may well find the estate agent for the other party will avoid engaging with you! The association of realtors had to make a very large settlement in recent times for uncompetitive practices, however this may not change practices on the ground very much.
I live in an EU country, not Ireland, where if the seller chooses to use an estate agent the cost to the seller is frequently around 4%, though some smaller agencies will go down to 2.5% or maybe even 2% for a higher-priced property. My point is that, viewed from such perspectives, estate agent fees in Ireland are very competitive! On the other hand, in country areas (I'm referring to Ireland), I've found some estate agents, or "auctioneers", pretty lazy. Not long ago I viewed a property, the agent opened the door, got back into his car and waited for us to finish. The place was in need of some work but he made no effort to "talk it up". As a seller, I'd want a lot more than that!