Recently, one friend of mine (refiner) bought 50kg of tech grade 53% nitric for lower price than this 1 liter. That 50kg is roughly 37 L of 53% nitric = or equivalent of roughly 25L of 70% nitric by nitric content weight.
I see how it works, making dollar is not illegal... But I do not feel comfortable with straight rip-off.
Take for example ammonium nitrate fertilizer. It is completely made of ammonia, just one part of the molecule is oxidized ammonia to NOx gasses, adsorbed to water giving nitric acid.
Conveniently you (as regular person) can get ammonium nitrate fertilizer (in this or that form, somehow prevented of illicit use), which is essentially more "processed" and expensive nitric acid. For few euros/kg here. In bulk roughly 1000USD/ton. Contrary, there is awful lot of folks selling essentially precursor for this 1000USD/ton chemical at prices you seen - up to 85USD/L, which contain like 1 kg of actual pure nitric acid. Actually, anhydrous ammonia is more expensive, running around 1300USD/ton on the market (2022). Nitric acid (tech 50-53%) market price in september 2022 in US was around 400USD/ton (direct inquiry from factory).
So fertilizer you can access for dirt cheap, nitric acid is selled with huge huge margin to the small customer. I now wonder how much the bottle cost vs. how much actual nitric cost
if divided to 1 or 2,5L containers.