This has been clearly established multiple time before IW even being announced (basically defining CoD since MW3), but just a fresh reminder.

Black Ops 3 Supply Drops are pure robbery

Also AW's supply drops, being the pure Pay to Win game to the franchise.

They make profits in BO3 because unlimited duplicates (decreasing the odds) + the <1% of ever getting a weapon = $1.7 billion. You could potentially open an ∞ amount of supply drops in either game and never get everything.