Extra Effort Costs for Psionic Powers - pls help

[Thökk]

Originally Posted by malloyd

It works on the numerical levels, which Psionic Powers happen to use, though most of GURPS does not. You calculate it as 100% (higher/lower -1), so 5 is 1.25 (125%) x 4, or a 25% increase. 5 is 5.00 (500%) x 1, or a 400% increase. 9 is 2.25 x 4, or a 125% increase.

So, a consequence of this, as I understand it, going from Ability level 10 to 11 has a trivial -1 penalty, while from 1 to 2 gives almost impossible to beat -10 without a substantial Will or skill investment.