I have been to Israel 3 times now and am about to make a 4th trip. I can see how it's totally weird to see this happening with a band that is from your 'neighbourhood' I must admit that OL was the reason I came to Israel first, but when I got there, I found that I feel very much a thome and so I kept returning. Also because I'm friends with the band ( I am not mentioning this to boast, but to explain)
For me it was always a wish to go to Israel, because I have always been interested in archeology, history, the Middle East. What better place to start than Israel? It is an interesting and beautiful country and for me also a start to get to know the rest of the region.
Returning to your initial point, the one about everyone coming to Israel. Same here, I mean I know some Dutch bands personally and to me it's weirtd that friends are known all over the world and people travel from all over to see their shows. Take Epica for example: about 2 weeks ago they had a show in Amsterdam and there where fans present from the USA even!
I think you should consider OL the best advertising that Israel has at the moment. They deliver a postive message and challenge people to look at Israel with different eyes and see beyond the usual newspaper items about politics.