Answer:
I am heavy forward, but backward I'm not. What am I?
Born of sorrow, grow with age, you need a lot of me to be a sage. What am I?
Roast, boast, coast, post. What do you put in a toaster?
You can read me both ways I wear; One way it's a number reversed a snare.
I am used to bat with, yet I never get a hit. I am near a ball, yet never thrown. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.