Collected some data
I donated 1,000,000 gold in 1,000 increments and got 63 stat raises
I then donated only 410,000 gold in 100 increments and got 66 stat raises (which maxxed out my character, so I couldn't collect any more data)
before:
Level 25 Troll Great Druid
--------------------------
Intellect: 35 / 35
Knowledge: 38 / 38
Physique: 36 / 36
Stamina: 46 / 46
Agility: 42 / 42
Charisma: 24 / 24
You are currently under the cap and have 283 stat raises available
After: 1,000,000:
Level 25 Troll Great Druid
--------------------------
Intellect: 43 / 43
Knowledge: 49 / 49
Physique: 52 / 52
Stamina: 55 / 55
Agility: 49 / 49
Charisma: 36 / 36
You are currently under the cap and have 220 stat raises available.
After 410,000:
Level 25 Troll Great Druid
--------------------------
Intellect: 60 / 60
Knowledge: 60 / 60
Physique: 60 / 60
Stamina: 60 / 60
Agility: 60 / 60
Charisma: 60 / 60
The Gods seem pleased by your donation.
***
You have already acquired the max stats allowed for your promotion level.
drink burn
***
All of your stats are now boosted by 15!
***
You fully consumed the burnet potion.
st
Level 25 Troll Great Druid
--------------------------
Intellect: 75 / 60 Boost: 1200
Knowledge: 75 / 60 Boost: 1200
Physique: 75 / 60 Boost: 1200
Stamina: 75 / 60 Boost: 1200
Agility: 75 / 60 Boost: 1200
Charisma: 75 / 60 Boost: 1200