Brawler dmg skills:
Agility - 1
I.M.D. - 1
Killstrike - null
M.C. - 1
M.D.A. - null
P.F. - 1
Wounding - null
Serendipity - null
Anatomy - 1
Level to reach: 10 000
Now it doesn't matter which of the unlock-able skills that I set to any number 1 or more, I will still get a lot higher cost.
If I set Killstrike to 1, the cost will be 824544 PED - if I don't set it to anything (null) the cost will be 426872 PED. With only Wounding as -null- the cost will be 1020327 PED
Edit: Take no notice of me - I guess this is because skills > 10 000 are still inaccurate to calculate with.