I got a bit of oil out of every ball, but not as much as I felt should come out. I took the balls out every half an hour or so and cleaned them with acetone (Haha jk, ball cleaner) and stopped heating them when I didn't see any more oil on the ball aside from the ring from what I was resting the ball on
Please remember that not only do balls absorb different amounts depending on how much they are used in an oily or a dry environment, it also depends on several other factors including the rev rate of the bowler and (this might be the most important) the oil absorption rate of the individual coverstock, whether it is polished or dull.
You should not let your expectations (and possibly your prejudices {prejudgemant}) rule your logic.
I just ran an 8 year old Lane Masters New Standard through 5 hours of a NuBall treatment at 145 degrees. Lane Masters balls, the old ones, at least, absorbed very little oil, PLUS their coverstock was almost 3" thick; there was no filler for many of them. No oil came out of this ball; I bought it used and expected a flood of oil to come out.