There are a lot of issues that need to be considered when buying or selling used stuff. But it basically comes down to how "hot" the ball you're selling is, the condition it is in, and what it's going to take the buyer to get the ball ready for him/herself. I've been getting all of my plugging, drilling, etc free for a while, so I can afford to spend a bit more on the cost of the ball. On the other hand, someone who does have to pay $40 to get a ball set up might not want to spend $125 out the door for a used ball, even if it is something that is nearly new. It's just a preference thing. For me, I generally won't spend more than $50 shipped for a used ball, unless I already know the seller or it's something that I'm really anxious to get. That's just me.
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Bowling is without a doubt the dumbest, most pointless, most idiotic excuse for a game that has ever been invented. So, what time are we bowling tomorrow?