Most of vet growers just still use GH. Even though GH has been diluted to point of water. We are all still over paying for nutrients.
Are you referring to the 3 part Flora Series? Overpriced? Sure, but it's user-friendly, convenient, consistent, and has customizable NPK ratios. You can even omit Flora Grow, and use Micro/Bloom only. It's a quality product, objectively speaking.
To some, over-paying is not mixing your own dry fertilizer powder out of 55 gallon drums of mineral salts. It's buying 5 lbs. iron EDTA over iron DPTA because the former is a little cheaper. To others, you're the one missing out if you don't run
Aptus/H&G/AN.
I use the Maxi Series, and if you compare it to
Advanced Nutrients, it looks like the deal of a lifetime. Compare it to Jack's Classic, and it looks like you're getting robbed.
Liquid nutrients cost more; no way around it. Scale of the grow matters too; I'm not rushing to save a buck on my nutrient regimen because it costs me, like, $30/harvest.