I'd imagine they don't do quick looks because there is no direct feed input like on consoles/3DS/PSP. They rarely use cameras on quick looks unless it's a special feature (Vita/Wii U launch), a kinect game (even then it's not directly on a screen and it's just supplementary footage) or if it's a QL EX. I hope the PS Vita redesign has video out then maybe we'd see Vita quick looks.lol
not sure why they bother,they don't even do QLs for Vita (I guess because it don't give them many clicks..since everything is about the clicks thesedays).