It has a lot to do with using a ball on its intended condition as well. If you use a hook monster on dry conditions, it's not going to last long. Ball death is noticed more with equipment that hooks more. It's like snow tires vs regular tires. If you use snow tires on snow, they'll last longer than they will if you leave them on all summer too. Oil extraction, cleaning, and resurfacing does help some, but all balls, expecially the bigger hooking ones, have a shelf life, but I haven't found any particular pattern or time frame for how long they last. In my experience though, sanded pearls go the quickest, followed by big hooking solids, then big hooking pearls, etc.