I'm confuzzled. Why decrease the number of Lore tomes from these?

[3.0] The number of Allagan tomestones received for the following dungeons and alliance raid dungeons has been increased:
Dungeon Before After
The Aetherochemical Research Facility
50 Allagan tomestones of esoterics
10 Allagan tomestones of lore →
150 Allagan tomestones of esoterics
10 Allagan tomestones of lore

The Antitower
80 Allagan tomestones of esoterics
40 Allagan tomestones of lore →
100 Allagan tomestones of esoterics
30 Allagan tomestones of lore

The Lost City of Amdapor (Hard)
80 Allagan tomestones of esoterics
40 Allagan tomestones of lore →
100 Allagan tomestones of esoterics
30 Allagan tomestones of lore

The Void Ark
50 Allagan tomestones of esoterics
20 Allagan tomestones of lore →
100 Allagan tomestones of esoterics
15 Allagan tomestones of lore