It's all preference, most of the people that add salt add it for weight, I don't use salt because it give the fish a different look, slower fall different action, fishermen seem to put a lot of people characteristics into a bass. Personally I don't think a bass spits a bait because it doesn't have salt. If it could sate the salt it would spit that nasty plastic out instantly, there is far more surface area of that then salt.