Wait.... are we really arguing that we get to raise an attribute from 1 to 2 by spending 10 customization karma and
then spend attribute and/or adjustment points to raise the attribute from 2??
As I read it you must
first spend your original (attribute-, adjustment- and skill-) points
before you spend your customization karma:
SR6 p. 66 Step Four: Spend Customization Karma
After the original points are spent, it’s time to think about a little development....considering during play if you want to buy aptitude and increase a troll's body to 9 you'd have ot pay 57 karma.
Buying the Aptitude Positive Quality and raise your Body attribute from 8 to 9 would actually be 69 Karma.
12x2 + 9x5 = 69
SR6 p. 69 Qualities
Purchasing a positive quality requires spending twice the normal Karma cost.(also, with an Aptitude Body Positive Quality a Troll would have a metatype maximum Body rating of 10, not 9).