D&D 5E Cost (in gold pieces) of Spellcasting

[Jester David]

It's the cost for organized play, which has to be a little more formalized and set, because there's no opportunity for a side quest to resurrect a fallen hero or ability to reroll a new hero at the same level as the rest of the party.

 

[Jefe Bergenstein]

Because the spellcaster doesnt have to put any effort into it and he gets his spells back every day. No skin off his nose to spend under a minute to make enough to eat like a king for a month. The guy who made the magnifying glass doesnt get to crap out 10 more the next day after a long rest. Casters would charge enough to not be constantly bothered, but still realize it's a renewable resource that's essentially like conjuring free money.