I mean she's not exactly wrong. While Reda cutting the cost of healing may seem good at first the fact he's cutting it so low might result in severe reduction of healers in the future and if he;s not around it fcould result in more people not being able to be healed in an emergency.
I do think that they shoudl set the price to soemthing reasonable
Yeah, only reason he can cut the cost so much is because he
- Has other, much larger, streams of revenue. Such as selling a dragon. And able to complete regular quests. etc.
- Has the amount of mana that he can use it to heal enough people that (theoretically, if there was a constant demand for healers - which this manga seems to think) it becomes a sizeable sum anyway.
- also matters in that he has enough mana to do both adventuring and healing without having to prioritize.
As a result he outcompetes people actually making a living of the craft, and add to that how health care is the type of thing that requires redundancies so you do not rely on a single healer who might get sick, die, already be on an emergency response, be on vacation, out-of-town, or in this case even on quests, so the price for healing has to be enough to
not merely cover the pay of a single healer. But actually needs to provide enough for several as they take shifts etc. Also stuff like the building, and taxes, and administration (I absolutely bet mc is not keeping journals on his patients).
Beneath the dragoneye moons had a whole mini-arc - and subsequently mentions and parallels to the concepts it explored - exploring this type of thing, where powerful healers (particularly ouathbound ones) could collapse the healing market so no healer can live in the same city. And everything is nice and good, until that healer died and the city was out of healers and stuff.
And even before that, back in remus, it explored how healers need to take money to survive to heal further - and that even if you are subsidised by the govnt and dont need the money, you can't go around and not take any money at all lest you make people expect healers to do so for free "out of the goodness of their heart". Or worse, expect the free healers to show up intermittently so they keep their ails unhealed for years until next time one drops by (mc's solution to this was to still perform free healing, but to target slums and poor neighbourhoods where they couldn't pay for a healer anyway).