Answer:
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it, can't see it. What is it?
I go around in circles, but always straight ahead, never complain, no matter where I am led.
I have a hundred legs but cannot stand a long neck but no head and I eat the maid's life. What am I?
My first is in riddle but not in little. My second is in think but not in brink. My third is in thyme but not in time. My fourth is in mother but not in brother. My last is in time but no t in climb.
While you were folding a letter you got me. Usually you will do whatever it takes to avoid me but now you can't help but find me.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.