[hcobb]

The problem with the suggestion is that all Giants (and Gargoyles) simply go to IQ 10 and stay there. Instead of rare geniuses these are now common.

I'd accept the first and second added points post-creation are 100 XP and the 6th added point is 1600 XP with the following racial exceptions:

Gargoyles never pay less than 500 XP to raise an IQ point and never pay more than 1000 XP to raise a ST point.

Giants never pay less than 500 XP to raise an IQ or DX point and never pay more than 500 XP to raise a ST point.

Reptile Men never pay less than 300 XP to raise an IQ or DX point and never pay more than 1500 XP to raise a ST point.

These are all post-creation. (Note that Halflings are getting hit because their 30 starting points are being counted like a human's 32 points so they hit doublings with two fewer attribute points.)