Like a previous poster said, the price of land is appreciating fast in many areas.
For Galway, I have seen the following
.5 acre site with FPP and no restrictions in Kilcolgan for over EUR200,000
.5 acre site in Inverin for EUR85,000 subject to planning
.5 acres site in Gort subject to planning for EUR95,000
1 acre site with FPP in Kinvara for EUR300,000
1 acre site with Outline Planning Permission for EUR175,000
(Have plenty of more samples if needs be)
I think that if you have land that you are willing to sell, I would be looking into perhaps getting planning on the land (be it Outline or Full Planning) and then selling it. From speaking with agents in Galway, there is a huge demand for sites in certain areas there. There are issues with local needs etc. that you would need to tease out. I'd suggest perhaps meeting with the planners at the council before you bother going too far with this..