In RAW's defense, I noticed that they recommend adding way smaller parts than most other lines. I don't know if that means the salts are more refined or if they're just honest about how much is actually needed. For example Kelp4less suggests 1/4 to 1/2 per gallon for their humic acid. Raw suggests 1/8 to 1/4. Kelp4less sales theirs for about half of the price as RAW. Interestingly enough, Kelp4less claims it's 80%. RAW claims only 59%, but states that it is derived from Leonardite, which is the most concentrated form. I can't find a source for Kelp4less.
So really in this instance they seem to be about the same price, but RAW isn't pushing up your EC nearly as much.