The only baits I pour with salt are also senko-style stickbaits. Other than weight, and possibly taste(debatable) the salt also reduces the durability of the bait. Most people like the salt content in the senkos because of the weight of the bait so they can T-rig them and throw them with no added weights.
This is just my opinion, so anyone who disagrees is wrong, (kidding-

) but I just can't see any reason to add salt to any other type of bait you are shooting or pouring. Any needed weight can easily be added via punch weight, worm weight, whatever your favorite sinker choices are...
I have spent alot of trial and error time trying to create like colors between non-salted and salted senko-style baits, and the hassle is beyond what I feel is worth it. (Cormorant- I know you are selling so I am speaking from a selling vein). for the casual or hobbyist, playing with the colors with salt added could be relaxing and fun!
Basically, salt is not necessarily a bad thing in my opinion, but as soon as you add salt to hot plastic you are creating speed limits and speed bumps for yourself. On the senkos, since they are straight with no appendages and aren't much heavier than 9 grams or so(with salt), it isn't a huge deal. (unless trying to match certain non-salted colors)
Others will disagree and I am smart enough to know my knowledge is only as good as my next knowledge sponging session.