@Azsy
10 million sounds a little too steep for a few potions
The debtor might just come back someday and be able to pay it off, so forgiving the debt isn't exactly prudent.
There's really nothing of note in the orphanage. They only brought the matter of the debt up and threatened to repossess the land so they can get the S-rank candidate to do a quest for them. Extension on the debt is just a formality and for all we know, it could be delayed indefinitely - the orphanage probably isn't worth 10 million. The orphanage is might be worth more as collateral.
But, MC can have the upper hand later on if he happens to make
extra potions. That old man was buying up all the potions everywhere, so MC would be guaranteed a bulk sale.