Re prices charged by spellcasters - obviously those are just a guide as to what prices PCs & PC-like NPCs are charged. The priestesses of Freya don't charge the faithful peasant 50gp for a cure light wounds spell; they'll do it for free. The faithful rich merchant donates a few gp. The Freyite adventurer back from goblin-killing gets charged 25 or 50 gp. The unknown adventurers who the priestess has never seen before who turn up demanding healing may get charged 50gp, or much more - I once had LG priests successfully extract 1600gp from a (LE) PC to cast a 4th level Restoration spell on him, 4 times the list price.