<span class="link_user">@Plagron</span>, The words you use are misrepresentative of reality. I feel compelled to reply. Hopefully doing math and making common sense conclusions based on facts does not put my account in jeopardy.
Just your base "canna a+b" nutes are 566% more expensive by comparison using the 20L pricing and instructed dosage. Adding your boosters, at 1/4th the dosage of the A+B to the mix would send this margin out into the stratosphere.
Plagron boldly claims of 70% more yield and terpenes from these 2 boosters? Those aren't even realistic numbers to anyone with an ounce of common sense.
The ingredients in fertilizers are mostly ubiquitous, so it's an accurate conclusion to say the additional cost is a bloated profit margin.