Musicians are there in front of you, and the spectators sense their tension, which is not the case when you're listening to a record. Your attention is more relaxed. The emotional aspect is more important in live music.
I guess the bigger you dream, the further you have to fall if you don't get it, so it can be a bit of a scary thing to be that ambitious.
The opera is like a husband with a foreign title - expensive to support, hard to understand and therefore a supreme social challenge.