Answer:
I am a little piece of paper, yet sometimes hold lots of value. I am all you need to get into big events, but will cost you. I am an important part of travel. And if lost, you're not coming. What am I?
I let water fall on you while everyone else stays dry. What am I?
I am an instrument you can hear but cannot touch or see. What am I?
I am the noblest musical instrument
What do people spend a lot of money on every year, but never want to use?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.