I think internally WWE sees Smackdown as the lesser show. Well wait, I'm pretty sure that's common knowledge...
Really though, for some reason they think that way. Though usually what happens every year that even though they gut the Smackdown roster is that whatever Smackdown is left with turns out to be pretty decent anyway. At least that's how I see it... a bit more wrestling in the show, less talking and some of the story actually hooks you in.
Really, it would benefit WWE if they took great care of their Friday show. But supposedly since their show is on a Friday they think its a lost cause due to the time slot its in. But that just intensifies the problem they already have, really.