“Do you feel left out when going to a concert unless you can get onstage with the singer or do a duo with him?”
No because I enjoy watching and hearing the concert itself. Whereas I don’t enjoy watching a bunch of men dancing around in circles for three hours. Probably most people are like that – many people pay to go to concerts, yet have you ever heard of someone paying to watch a simchas torah style performance? Additionally, it definitely would make the concert more enjoyable if I could get onstage (assuming I wanted to do), and all the more so if half the audience was onstage.