[img]http://i.imgur.com/q8UkJZ3.png[/img]

Cost: 32 million MP
Assume each rune sells for 250k MP
Amount of runes needed to sell to break-even: 125

Assume one rune is rewarded per 20 quests
Amount of quests needed to break-even: 2500

Assume each quest costs 10k MP
Amount of MP needed to do 2500 quests: 25 mil MP
Assume each quest rewards 3k MP
Amount of MP earned through 2500 quests: 7.5 mil MP
Netto: 25 - 7.5 = 17.5 mil MP loss through 2500 quests

125 runes amount to 32 mil MP
32 - 17.5 = 14.5 mil MP gain
So 125 runes amount to 14.5 mil MP gain
Final amount of runes needed to sell to break-even: 276
Final amount of quests needed to break-even: 5517

Progress: 169 runes sold
BREAK-EVEN POINT REACHED AT 169 SOLD RUNES!! 33 MILLION MP IN SHOP TILL (TILL WAS CLEARED BEFORE SELLING RUNES AND PROFITS FROM NON-RUNE ITEMS WERE SUBTRACTED)
Amount of quests done: 3256 (but actually less quests was needed to break-even because I still have some runes that haven't sold yet)
Amount of runes received: 190
Personal ratio: 17 quests per rune
Theoretical amount of quests needed to break-even: 2873

New progress for ratio continuing onward: 9 (0)
(+0 after temple) runes sold = X
Netto profit: X - 169 = ...
(assume theoretical profit is 1:250k, rune:MP)