Answer:
Why is it so easy to weigh fish?
I am the tool for inspiring many. Buy me in the store for not much more than a penny. Don't overuse me, or my usefulness will go. What am I?
If you're looking for something sweet I know what to do. But if you don't like heat I'm not for you.
I am bought by the yard but worn by the foot. What am I?
Squeeze me and I cry tears as red as my flesh but my heart is made of stone.
I am a rock group with four members. All dead one was assassinated.