I think the audience does make a difference. I know Jon will change a setlist dependent on the audience reactions to certain songs. If they pull out "Never Say Goodbye" at the end you know you've been a good audience.

If they pull out "Always" (if it wasn't already on the list) you know he feels like the crowd isn't into it. I was at the show they proclaim to be the worst of their career--Knoxville 1993. Of course, I can't tell you much about the crowd because I was in the 2nd row. LOL However, looking back, I can imagine it probably was a pretty rotten crowd. I was able to move about, and that close to the front, that really isn't normal. I really don't stick around any city long enough to guage whether the audience is truly reflective of that city.
Becky