Ahh, the New Zealand Lord of the Rings Extra scenario has a Game of Thrones variant, I see.
Season 4 had over 2000 extras, plus there are many, many people who for one reason or another have only done one season so there are even more extras than that, and Northern Ireland only has a population of 1.8 million. Add in the costume, hair and make-up people, the assistant directors, the prop people, the armourers (the main one is actually southern Irish but the other one is from the north so whatever lol) and other misc. crew (bear in mind also that there are two production units so that pretty much doubles the staff - and there used to be 3 units) and it's a sizeable % of the population who who've worked on it. Also, some of the main cast are Northern Irish, including Michelle Fairley and Kristian Nairn. So I'm not exaggerating when I say just about everyone knows somebody personally who worked/works on the show in some capacity.
Maybe given enough time we might get to be known for something a bit more positive than bombs, bigottry, rioting and the fucking Titanic lol.