I noticed the same thing with my Bite. In the time it took to throw a strike, sit down, wait for my next turn, and go to pick up the Bite for the next shot, most of the oil had already soaked in. I could barely see evidence of oil rings from the previous shot.
I still wipe down the ball before every shot; I don't think anyone would appreciate it too much if I started waiting for my ball to return from a shot and wiping it down AFTER every shot, but that was the thought that came to mind!
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~SprayNpray
-formerly known as SawFreak