Gotta love villagers that tell any passing person about your skills without any consideration. Luckily almost all fantasy MCs are doormats so it’s all cool.
Of course the above can be argued away;
* Did it for his benefit to get him a job
* Too ignorant/undereducated to consider possible long term repercussions.
Guess he’s lucky that wealthy merchant wasn’t one of the dangerous ones.
> Thats unlikely of the merchant.
If he handles the way he reacted to MC's potion, i think MC will agree to constant delivery of his product even if its prototype.
His company can appraised the item and sure it is a fine product itself.
From there, Mr Merchant can call MC to have a limited amounts of potion per month as an exclusive/premium product if he hadnt reacted that too much to MC...