Yea ik 50 is ALOT.i dont really play survival,so idk the percentages,lets say king is 1-3%,there is a 97-99% chance of u not getting it,thats HUGE.
Btw , sell the items u got from the crates(such as the tags and the pvp sets),You'll be able to gather back a hefty amount.Try buying a king with...