Yup, reactives and particles have a softer, porous shell, and they suck oil. Lots of it! The MONSOON cover has a bad rep for dying soon.
Polished balls are a bit more secure, since their surface is waxed, but it will not help much. Particles and opened up surfaces (a.k.a. dull/sanded) are most likely to suck oil, and this hampers or even kills your ball performance over time. Polyesters are almost immune. The D-Rex scale is a good orientation. The softer the ball and the coarser its surface, the more likely it is to suck oil like a sponge.
Have your ball de-oiled. You can do it at home in your oven (low temperature! No heat shock or the coverstock might crack!) or put the ball in a bucket with warm/hot water and some detergent - see the various discussions in the surface prep area of this forum. You will wonder what your ball will ooze out, and it is not only lane conditioner, but also all kinds of dirt, machine oil, wax etc.
If you are not sure ask a local pro shop for help, there are professional machines for this purpose, for a fee.
De-oiling your ball will certainly change its performance and increase grip.
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DizzyFugu --- Reporting from Germany
"All that we see or seem, is but a dream within a dream..." - Edgar Allen Poe