But I think in order to be a great performer, one should understand how the audience would respond to the performance, and adjust accordingly.
But then you are playing for the audience, and not for yourself. This, in my honest and most humble opinion, is not good to do for every performance.
Here I will go on about my saying (which you may quote at any time): You must conform to be successfully different. To become a well known performer, you must first get your name out there, and that involves playing flashy/showy and well known repetoire because people are buying tickets from seeing the recital list, not your name. After that, you are then able to play what you wish and not have to worry about guaranteeing an audience as they will most likely be buying tickets from seeing your name, not the recital list.
Where you say 'to be a great performer, one should understand how the audience would respond to the performance, and adjust accordingly,' I see that as adjusting the repetoire being played, which I'm sure is what you mean by it. But this is where my honest and most humble opinion comes in, and what I think about playing music in general. I think that it is best to play the music for yourself, and that a recital/performance is simply allowing others to watch and listen in. I think that playing music should be entirely for yourself.
That being said, I'm going to go play my composition to my aunt. Not because I am playing it for myself, and she is listening, but because the recording I have on CD is rubbish.
Heh, I'm such a hypocrit, but wateva! lollers

Henrah