[webheart]

Is that because of possible health problems from the salt or to keep it from adding unwanted taste attributes to the recipes?

You have to ask what the reason is for having two kinds of butter. Salt was originally added to butter when it became rancid, to cover up the nasty rancid taste. I guess that the quality of butter these days is such that the stuff with salt isn't rancid anymore, and therefore salt is unnecesary, but salted butter is still available for people that are used to the taste. I prefer unsalted butter, but my lovely wife makes me buy salted butter because of the taste of salt. She has no problem with blood pressure. To me, it isn't worth marital disharmony over the difference.

[BfloGuy]

my lovely wife makes me buy salted butter because of the taste of salt. She has no problem with blood pressure.

Another myth. Salt doesn't raise blood pressure.