How "flat" should leaf springs be?

I just noticed a couple days ago that the leaf springs on Aaron's Dart Sport appear to lie almost completely flat when you get down and look straight up them from the rear. In other words, there isn't really any noticeable arc in them. Is that typical, or are they pretty much worn out?

A local brake and spring shop estimated it would cost roughly $150 to have all the springs re-arced. I've been reading in another thread about the ones offered by J.C. Whitney, reasonably priced and shipped to your door for less than that.

Any comments are welcome,
Jerry