i think the best way to think about looking at ripping old wax is not "well, what $$$ card could i get out of it?"
but rather, "man, remember when me and (insert friend(s) name(s) here) were on the corner/yard that day, and (he/they/you) pulled that (star/most cherished player's name) out of the pack?" feeling that only ripping wax from our childhood can give you.
Prior to the invention of "Insert" hits in packs, the "best" card you could pull was that of your favorite player(s) because they all had the same "value", and the same odds of getting whomever you wanted out of a pack.
if you are ripping old wax looking for the next big money card, you are surely going to be dissapointed. keep that in mind. if you are ripping for the next "PSA 10", then just buy the PSA 10 because it will be MUCH cheaper to do so.