Gaga,
Folks in Ballybunion are very welcoming, but we tend to forget that it is a private club, just not what we think of as a private club here in the States.
Basically, the demand for golf at Ballybunion has grown enormously in the last ten years, so much so that members have decided to cut back on outside play during the summer months. Thus, it is not going to get any easier to play the Old Course anytime in the foreseeable future, at least not during the peak months.
I go over about 3-4 times per year. In 2001, my trips were in January, March, June and September. Perhaps I'm just crazy, but I'd say the weather in January was as good as the other times and it was a delight to play. I realize you are not going to change your travel plans, but someday go back and be more adventurous. You won't have any trouble finding an enjoyable game at Ballybunion.