I thought I'd move my comment here where it won't get lost. So here it is. :P

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Just a thought, but what about a level crystal config? For example, one I might use is;
[PetRes]
Lifespan=-1
LoseInventory=true
KeepEquipment=true
ControllerRefresh=30
RequiresCrystal=true
AddCrystalAtLevel=30
AddCrystalAtLevel=60
AddCrystalAtLevel=75
AddCrystalAtLevel=90
AddCrystalAtLevel=100
AddCrystalAtLevel=110

So on so forth till I was satisfied. Each one would count the previous crystals. So at level 110, it would cost 7 life crystals.

Lets not forget to add a "DoubleCrystalAtLevel=", for doubling what it currently takes. 2 to 4, 4 to 8, etc etc. Maybe even "MultiplyCrystalAtLevel=" if you can figure out how to do that one, maybe default multiply by 3, or add a value earlier in "Multiplier=3", who knows. Just throwing some things out there.