Well, personally, I am not there just for LaBrie. I am at their shows because I love the music of Dream Theater. I am glad they're not picky with their sets and will include whatever they feel like. That's what I love about their sets now.
With that said, when I am there, I am not just listening and analyzing the band, I am there to enjoy the songs and that includes singing along to the lyrics, because those lyrics at times, speak to me.