It also doesn't help that McFarlane doesn't do many of the core female characters in their more popular looks. We had all sorts of weird Wonder Woman variants before we got a classic (and that one sold out in seconds). He's just now getting around to her modern look....and she's packed in with a Godzilla statue. No Black Canary, Zatanna is just now being revealed, and we're just now getting Hawkgirl.
DCUC may not have had many female figures either, but at least we got Wonder Woman in an early wave with her classic look. Core characters like Supergirl, Batgirl, Black Canary, Zatanna, Power Girl, Hawkgirl, etc. got released in a fairly timely manner. As it is, I seriously doubt we'll see a classic Harley Quinn, or any iteration of Black Canary, before Todd loses the license.