Answer:
People are hired to get rid of me. I'm often hiding under your bed. In time I'll always return you see. Bite me and you're surely dead.
My life can be measured in hours. I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
Three little letters, a paradox to some. The worse that it is, the better it becomes.
With pointed fangs it sits in wait. With piercing force it doles out fate, over bloodless victims proclaiming its might. Eternally joining in a single bite.
Neither bought nor sold but more valuable than gold. It is built but not by hand. What is it?
I can only be played on a windy day