DF 1 & 8 - Magic Item Cost Disparity?

[evileeyore]

So the rules in DF 1 say this:

Note to those with GURPS Magic: Costs assume that enchanted items up to 100 energy points are Quick and Dirty ($1/point), that more powerful artifacts are second-hand Slow and Sure items ($20/point), and that alchemical amulets are rare ($66/day, plus ingredients).

It then lists these Enchantments:
Spell - Cost
Deflect - $2,000
Lighten - $100

Both are 100 energy to enchant.

Further in DF 8 Treasure Tables these are listed:
Accuracy +2 (Projectile) - $100
Blur 1 - $2,000
Foul Water - $2,000
Ignite Fire - $2,000
Noise - $2,000
Pollen Cloud - $2,000
Puissance +2 (Projectile) - $100
Quick-Aim (2 turns) - $100
Repel Animal - $2,000
Repel Spirits - $2,000
Shade - $2,000
Umbrella $2,000
Vital Seeker +1 - $100

Note, all of these require 100 energy to Enchant (with maybe the exception of Vital Seeker, being there are no rules for Enchanting outside of DF 8 Treasure Tables), so why are some listed at $100 with others at $2000?

Okay, I can see just saying "Everything 100 energy or more, except for Ammunition Enchantments and Lighten, cost $20 per point". I mean Blur and Deflect are very sweet and would be on everything if they were only $100. But why are some of those weak utility enchatments up there as well?

Or more to the point, what makes Ignite Fire more valuable than Lighten, or as valuable as Pollen Cloud?