120cp...worth it or no?

Handoftheking26

So I am finally a 4* transitioner (i think), I have like a dozen 4*s champed, and most are good ones. But I still have many many chars that need covers and/or Iso (like a cool million wouldn't cover it lol). So my issue is I now have 2 4*s with 12 covers, and they both seem pretty beastly, Rulk and Max. Is it worth it to save up 120cp for that last cover? Even if i still have a good 10 chars that are pretty tough and still need multiple covers? And need ALL 5*s still, not one color is maxxed yet. And I am mostly PVE, so it isn't exactly raining cps either.