I think DC takes those risks fairly often, they just rarely pan out because that's the nature of comics. They gave Vibe, Amethyst and Klarion their own books, and those are all D-list characters. Most attempts fail but you keep trying until something catches on. Kamala Khan, for instance, has caught on for Marvel right now, but before her there were several attempts at pushing old and new female characters that repeatedly failed (and still do, Captain Marvel's book sells like crap every month but Marvel keeps it alive because they've pushed her for so long they can't admit at this point that no one considers her either popular or iconic). Who even remembers that there was a female Ghost Rider?
I don't think Starfire is published as a series that builds on Harley's popularity but rather as one that builds on the popularity of the Conner/Palmiotti team. They've had a good deal of success writing DC's female characters; I'm pretty sure they were put on Harley in the first place because their Power Girl run is popular.
If they really wanted a sales bump they could simply make Damian a permanent member of the cast, especially since Didio has said continuity will take second place to story so there wouldn't be a clash with the Year of Blood in Damian's own book. You can't really do a story about kids in Gotham and ignore Robin.
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