Board Thread:Questions and Answers/@comment-174.127.224.220-20160217212314/@comment-95.112.174.247-20160404105420

With every relict you pick up the chance that a new one will drop goes down. That would mean that at some point no new relicts will spawn but I am not 100% sure about that.

But yes, the more you have the smaller is the chance to find new ones.