Well, this doesn't have to be the case, but it's an excellent point and happens often. This problem illustrates the difference between playing to/for yourself and to/for the audience. I have a performer friend who loves to say, "The only thing that matters is that the performer has a good time. If you enjoy it, the audience will, too." This is not true! I mean, it is for some audience members, but doesn't work at ALL on me, nor for many other concertgoers. Some performers really need to be more giving. If you play with the same nuance that works in your living room, the expressive gestures aren't big enough to convey your ideas in a concert hall. We have to think about what's engaging for the audience and make our ideas clear. And also LOOK GOOD. A woman gave a concert in my city a while back who played quite well--and looked like a million bucks. Bright red flowy silk dress, sexy in a very classy way (no cleavage), sexy shoes (these were perhaps a mistake, because her pedaling was not very nuanced, but anyway...). And of course people noticed that she played well, but she was also just wonderful to watch--and since people are watching in a live concert, why not look fantastic? But back to the playing-for-oneself thing, singers are guilty of this, too, if they're not stopped. They close their eyes and sing to themselves, which is a big no-no, but it feels good and you have to really sit on some people to break this habit. I'm so pleased to see all the people here who play chamber music.