Except don't change the costs, instead change the rewards. Maybe this is already in game, because at level 20 or so, more finesse only added a 2.0% increase. So if at that point one point in Str adds the large swings we see at character creation then this would be a point in favor of stat diversification.
No, it isn't. Those numbers count for ever point above 10. (except Const and Memory)
Also the benefit for each point ist down to 2% per point already at level 8. You started with 15% at level 1 for the three base stats, wits starts with 2.5 per point and goes down to 0.3 per point at level 8. Meaning at level 8 you need about 8 Skill points for the same effect you got at level 1 for 1 point. Seems to be a linear devaluation.
