If your net income is 3000 a month, with a probable rent of 700-1000 a month, if not 1200-1400, regular bills of 100-200, car/transport of about 100 a month, unless you live on dried lentils, you will struggle to save about 1000 a month.
Also bear in mind that many of the sub 200k properties in Dublin are 1 bedroom units, for which lenders demand 20% deposit, so the cost of borrowing for the smallest units demands a 40k deposit, not 20k. This is why so many are unable to even apply for mortgages they cannot qualify for, not to mention other conditions like having no other borrowings, a full time permanent role for more than 2 years etc.
Even an income of 70k or so is not enough, when you take into account all of the above. Also I notice that my bank demands 15% deposit minimum so not sure where you are getting the 10% quoted above.
And by the way, that doesn't include conveyance fees, stamp duty, solicitors fees and management fees - about 5k for the first 3 items and management fees typically 1200 to 1800 pa in Dublin right now.
This is based on my own experience of trying to buy earlier this year, not some theoretical idea of what anyone can afford. I am no fan of the housing hysterics, but it is quite difficult for those trying to housing themselves right now.