Hmm.
Let's say it worked out in a break even scenario:
First ones the gimmie
Let's say next ones bad luck damn.
Next one unique and now your 50 percent.
Oops damn another miss.
Oops damn another miss.
Hey got number three.
Duplicate.
Duplicate.
Duplicate
Duplicate
Hey there it is.
This is a good break even scenario right?
You were looking for four, but 11 dropped to finish a set right? Those misses are annoying though but this is a run of the mill break here.
Now imagine an unlucky scenario
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I didn't write it out this way to insult anyone on how statistics might go, but just to illustrate the pattern of annoyance as you loot them.