thing is, tits only sell if you're selling tits. People will stare at art of peeg all day long, but it doesn't make them more likely to buy a comic about her unless that comic is about her rubbing them on people's faces.
Its like those ads you see on websites where they use sexy anime women to entice you to play boring RTS games. Has that EVER worked? No. Tits only sell if you're selling tits.