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?
The more there is the less you see.
I am not a toy though many use me for pleasure. I have a butt but I cannot poo.
I produce wool and spit a lot
What do you get when you mix lemons with gun powder?
What is always coming but never arrives?