Firstly, let me say I'm totally against entrance fees, but the article gives a skewed impression of the golfing scene in Ireland. The clubs listed at the end of the article are special cases in my opinion. Nearly all of them are old established clubs that are very close to or are surrounded by towns/cities.
I don't recall exactly what the population of Galway City is (70-80,000 maybe), but for many years Galway GC was the only club in that city. They have always had a queue and it's no surprise that they charge an entrance fee. The same applies to Cork GC.
The Dublin clubs listed are in the city, and as Ally has said, are all in well-to-do areas where house prices during the Celtic Tiger were over €1-m; they may have now dropped to €750-k. Paying €10-k to join a club is peanuts when you're house is worth €1-m. These clubs are surrounded by houses and their land value a few years back would have easily been greater than €100-m each.
The entrance fees listed are not related to golf course quality; it's a result of distance from the urban areas and a lack of courses in built up areas. Killiney's fee is so high (especially for a 9 holer) because it's located close to where the "beautiful" people such as U2 and Van Morrison live.
I have played The Grange and it is a good James Braid course. Unusually, it starts off with two par threes. I'd recommend it to anyone. I have also heard good things said about Milltown since it was renovated by Mackenzie & Ebert. I've read great things about Jeff Howes' work at the Castle course; this is an old Colt design.
I didn't see Foxrock in that list, but I'd imagine that it wouldn't be cheap to join.
Ireland has a long way to go to get back to a situation where costs are realistic. It's easy to blame a club for high costs, but everything from insurance, GP fees, medicine, day-care, legal fees, vehicle registration tax, breathing air tax
, rental and lease fees, etc. is expensive. It's costs over €1000/month to put a child in day-care
Insurance costs are just a joke. All these costs are passed on to you and I when we visit. The death of the Celt Tiger should be a blessing in disguise, but unfortunately the things that need fixing are not being addressed properly. When the economy improves, watch out for the return of those entrance fees. The "cute hoor" Irish can't resist ripping you off, especially if you're a tourist.