The name doesn't bring any value to a business, so it is worth zero. Yes, it could be functional for some type of football site or something on testicular cancer, but it is still worth zero. If I tried to sell three stamps on here for a dollar they are still worth zero. Yes, someone could use the stamps productively, and yes you can send a letter thousands of miles with one stamp. But time is money and three stamps are worth zero in a situation where you are trying to sell them, because the moment you invest ten minutes into the transaction you are running behind.
Even though this name is worth zero, it is still better than a lot of names in this section of the forum. You probably have spent more than thirty minutes on this name already. You will never get even. People who start out in domains and try to reinvent the wheel are wasting a lot of time. This name is not horrific like most here, but it is still a dud. Just like a plain girl or a boring guy will always be a dud. A dud is a dud is a dud.
Step outside and approach the first person you see. Tell them you own the name SackPain.com and let us know what the response is.