I'm covered in numbers but I do no maths.
I'm sharp and pointy but I do no harm.
I get paid to do what costs me nothing.
Some people like me but others may prefer my friends.
What am I?
HINT ONE
I would define paying someone or something as giving it/them money.
HINT TWO
The lines of the riddle may refer to different parts of me, but they all refer to the same me, no synonyms are used.
HINT THREE
The title is also a clue.