The single image sales was what made me sign up with them last week. For the subscription only, it doesn't look fair to me, just like SS.
Regarding the vector files, unlike other sites, you have to upload the EPS only. I think it's a mistake not to allow a high res JPEG together, so that a buyer that does not know anything about vector images has an option. Thus, for a while, until vector picks up there, I'll stick to the raster images, unless they won't accept them anymore (I've asked).
Regards,
Adelaide