Resurfacing will get the minor scratches out of the cover, and make some of the larger ones not so large. When finished resurfacing a ball the proshop will be able to get it back to OOB condition, or a different finish if you so desire.
I highly recommend doing this before spending extra money on a new ball. I recently resurfaced a blue offset hammer 3D, which has been my favorite ball in the bag for about 8 years, but not used much this year due to a bad reaction. It is back to it's original reaction, and it is once again a favorite ball of mine that I have no problem pulling out of the bag when I am not scoring and lost.
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Let in the DOGS - I've got a HAMBONE for them!
To all the haters, get over it!