How, ordinarily, is someone helpful in DDO?
Do they put up pugs?
Do they help new players?
Do they teach raids?
Do they recruit to guilds, join other people's pugs and generally participate in the community?
Do they spend money in the store to keep the company going?
Now, if this same person duped some large greensteel ingredients for personal use, are they then an evil duper who has made a net negative contribution to DDO?
Obviously that's a single example, and someone who only solos, never buys any points, and duped a million true globes and sold them on the ASAH is another side of it.
I'm going to ask a question now, and I'm going to try and make it as neutral as possible.
Can you now see how defining someone as good or bad for DDO by the sole metric of 'whether they duped or not' is a poor test?