Not sure on the basic figures. There are a lot of them around. However limited-run things like statues and mini-busts might see increased interest. I've only got one Maul figure and it came as part of a glass and figure set.
I don't know, but I know they finally made a near-perfect Maul in the eyes with his TVC release. Near-perfect except for the fact that his droid caller is painted onto his wrist, and I think I read something about his belt being packaged on him backwards, I wouldn't know, I keep everything boxed. Too afraid of peices snapping off and whatnot, plus I have twin infant daughters and am morbidly afriad of them choking on small peices. I keep them all stored safely away.