I agree with Mark and others that each person has the right to assign the terms gain or win or winning to any of their abilities or achievements. This right extends to both Geir and Charlie Sheen.
Others have the same right to observe and evaluate whether that person's really had a win/gain or not.
There's no experimental design that can control for individual changes in one's life or even one's own perception of those changes. Individuals can't get a do-over to add or subtract Scientology from their lives. There's no way to know whether an individual lost 20 pounds, won the lottery, got laid or found a parking place as a result of Scientology. Likewise, there's no way to know whether someone didn't die in a car crash, didn't have their identity stolen, didn't contract an STD, or missed the bus home as a result of Scientology.
Individual and group trends are useful in developing hypotheses. However, they're not conclusive. Yes, you can measure the attributes, behaviors and accomplishments of different groups (Scientologists, non-Scientologists, ex-Scientologists, etc.). However, members of these groups self-select into these treatments with no way to control for the non-randomness of the group membership. Obviously, pre-existing differences among the groups could invalidate the import of any group differences.
A little regression analysis on large samples might shed objective light on this debate -- using valid early childhood intelligence and achievement test results and personal histories of childhood, birth family, medical, employment, marital, sexual, criminal and other events. It would be so much fun to have access to that information and perform those analyses.
However, we're not going to resolve whether Geir had gains from Scientology that he wouldn't have gotten without Scientology. He knows himself better than anyone else here, and I'll take his word for it.
TG1