Its about escapism.
The world is a cruel, tough place. Yes I know, you are thinking theres a lot of good out there too. But its still a struggle. We all have problems. Even the lucky richest people alive have some type of struggle to deal with. We want to get relief from that, even for a little bit, so we turn to entertaiment.
But the funny thing is, struggle & conflict are integrated into entertainment as well. Look at sports. Football and hockey are about overcoming another to take his territory, or defend one's own, etc. Even in literature, look how Harry Potter and Mr Frodo had to fight evil! When you look at music, theres a lot of conflict there too. Groups like Guns&Roses going wild on stage or in hotel rooms.
Celtic Womans music is all about hope, love, smiles, peace, etc. Plus its packaged in a very attractive way! CW does a GREAT job at combining the audio and visual. Plus theres variety. Its not one singer over and over, but at times solo, at times emsemble, at times even instrumental. NO other group, or performers, can match what CW does at such a high level of talent and quality.
But when one of us attends a concert live, or watches a dvd, or even just listens to a cd, for a brief period of time, we are in a much better, pleasent place.
I couldn't have said it better myself. They bring hope and love to the world and everything is better when they're around.