Every once in a while I spot a clothing/head combo that can be purchased for less than a completed figure would cost. Yes you'd still have to buy a body but those can be found cheap depending on whether you want to show the joints or not. This is the first DC release I've seen with this option for the upcoming movie Suicide Squad which uses Harley Quinn.
It's still a little pricey at certain places although I first saw it for $60 something. If this was applied to other characters we'd quickly get several characters made at a reduced cost. That said it does feel a little doubtful we'd get sets like this for bigger names like Wonder Woman. I think the only reason Harley is here is because the SS brand isn't as notable not Harley herself.