Oh absolutely. When one realizes what these companies mark-ups are, it's fucking insane. There's money to be had with the right branding, marketing, and product. IDK what y'all have in terms of environmental laws on the other side of the pond, but storing bulk will likely be your biggest hurdle. Here, the EPA would be all over anyone with a warehouse full of chemicals just like they are on top of the little mom and pop mechanic shop down the street.
I can attest to the the price tag for cannabis marketed salts. I paid $150 for 25lb part A and $170 for 25lb part B of front row ag. Their brochure/feed schedule has cannabis silhouettes on it. Not subtle at all. Same volume of megacrop would've cost 1/3, but I was between a rock and hard place at that point due to poor planning.
Don't get me wrong, it's good shit. However, it's expensive good shit.
Back to the point. Buy bulk of AG grade nutes, break em down to consumer volumes, tack 100% markup on the volume, and make $$$$$$