House Rules for Spell Casters

[DAT]

Was thinking of implementing a house rule for spell casters, and am interested in folks thoughts.

House Rule:
Mage points for casting spells is equal to a multiplier, based on Magery level, times FP.

Magery Level Multipliers
Non. 1/10
0. 1/2
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6

Was thinking of not giving a cost reduction for skill, but I am not decided.

For different mana levels (none,very low, low,normal,high, very high) was thinking of applying additional multipliers.

Mana Level. Multiplier
None. 0
Very Low. 0.25
Low. 0.75
Normal. 1
High. 1.5
Very High. 2+


What are folk’s thoughts on the idea and on the multipliers?
-DAT