Nice job, but the biggest flaw is that some skill required a whole chain of skill to be enable. So some skill worth a lot more then the cost in runes to unlock it.
Per exemple, the well of mana belt
gives you +20% mana recovery and +3 mana/turn
The skill concentration gives you 2 mana/turn for 9 runes.
But you need to unlock at least 4 skills for the mage (5 for other classes) meaning you need a combine cost of 39 runes to at least get +2 mana/turn.
It does give you other skills: + int., +4 mana, +30% recovery, unlock order magic and +15% to some order spell
Base on your calculation:
+1 int = 5 runes
+ 4 mana: 6 runes
+15% to some order spell using the value for damage % on attacking spell = 10,8 runes(~11)
- I didn'T count the difference in % recovery (20% for the belt vs 30% for the skill)
Meaning to get the cost for 2 mana/turn skill only you need to invest (for mage) : 39 runes - 22 runes = 17 runes (instead f the 9 for the sole cost of the skill!)
So 1 mana/turn = 8,5 runes
Meaning the Well of Mana belt worth 25,5 runes instead of the 15,3 runes.
But the investment in rune is temper with leveling up of the skill meaning for +8 mana/turn doesn'T cost 8 * 8,5 but a base 39 for the first +2 mana/turn plus 27 for the extra 6 mana/turn
for a total of 66 runes - 22 runes (added skills) = 44 runes for 8 mana/turn
So 1 mana/turn = 5,5 runes
The well of mana = 16,5 runes
Now it's a lot closer to you value. So the value of the well of mana belt is between 16,5 runes and 25,5 runes.
But I wonder why you chose Absolute balance for the mana, you could simply use the wisdom skill since it cost a lot less and I don't think you should count the scroll ability towards it :
20 runes for +18 mana --> 1 mana/ rune
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