Shermster,
There have been multiple posts about this subject of ball death. I believe that bowling balls today are like sponges and absorb lane oil at an ever increasing rate. Why? The faster the cover can wick away oil the more it hooks. Well, these pores become more and more clogged, saturated if you will with the lane oil that the speed at which the cover can wick away oil is deminished. Thus, less hook.