The 5 copies are awarded as follows: 2.5 mil personal pp, 5 mil union overall pp, 55 mil union overall pp, 150 expert demon death count, 150 ultimate demon death count.
I think 55 mil is decent enough for a guaranteed goal, as compared to say the normal Raid's event gacha where you have to rely on luck. Not to mention if they even implement the gacha rate properly.