While I think Greece or Ireland would be a great addition we already have England and Italy which have a lot in common with these two. More importantly everyone has to realize that Money is the important factor to consider and at the present time Money is one thing Russia is one thing they have a lot of and it's one thing that neither Greece nor Ireland have much of. Also they are not many companies (none that I know of) based in either Greece or Ireland with deep pockets.
It's not even remotely true that Ireland doesn't have money. In fact, it's economy (referred to as the Celtic Tiger) is one of the strongest in the world right now.
There are many large companies in Dublin-information and communication technology, banking, global pharmaceutical as well as the Guinness Brewing company. Many companies have their Eupropean headquarters there -Google,
Amazon, Microsoft, pfizer, yahoo, Citibank to name a few. Even Bono said Dublin "Is all about the bling now" Look into the prices of homes in Dublin, apartment rentals, etc. The average age of a Dublin resident is in the early 30's. Dublin is the 8th most expensive city in Europe but is number 4 for highest wage-higher than both New York City and London. Pick up any recent travel books on Ireland, or you can even watch the recent Samantha Brown specials on the Travel Channel, and you'll see an amazing country with a stronger economy than our own (at least right now).
That being said, I do thing there are many Irish products already available in the United Kingdon pavillion...while I would love to see an Irish pavillion, I don't think it would happen.