The authors shitty writing is the only reason why none of his friends are gonna die. If he was reasonable then Rimiru's unreasonable orders would've gotten everybody killed by now. Asking them to win without killing against a dangerous opponent who will want to kill you is just asking them to die.
Why would they sell the potions for the same amount as others of the same quality?? Doesn't that miss the point of it being a specialty? If you can make more of a product for less money than other competitors then you would be able to sell it cheaper. If it's cheaper than your competitors then...
Honestly, if this group didn't pick up this manga then a better one would've. But because people don't like to snipe we might only get better-translated chapters when ai gets good enough. Which could possibly take a decade.
I honestly don't expect someone to re-translate these chapters..