Unless you have a ton of space and money, i get the impression these pieces are aimed at those who want to own just one piece, and not collect. I could be wrong..
I own the Prime 1 Margot Robbie Harley. As much as i like the Prime 1 Comic Harley and the Prime 1 Arkam Harley, does a collection need 3x 1/3 Prime 1 Harley's? i don't think so. Since my budget and space is limited, if i want more 1/3, i'm probably better off going for Prime 1 Poison Ivy
The Prime 1 Comic Harley is somewhat epic