Can someone explain why brewing low level potions at higher levels is so costly rules wise? I get the math part.
Potion Brewing cost = 25 x× spell level (0-3rd) x× level of the caster as stated in hereCreating Potions.
So at the following levels a Potion of Cure Light Wounds cost:
Lv5. 25 x 1 x 5 = 125
Lv10. 25 x 1 x 10 = 250
Lv15. 25 x 1 x 15 = 375
Lv20. 25 x 1 x 20 = 500
5: 25 × 1 × 5 = 125
10: 25 × 1 × 10 = 250
15: 25 × 1 × 15 = 375
20: 25 × 1 × 20 = 500
It seems that making a profession of brewing potions doesn't seem prosperous.