Which I am aware of. It merely shows they could lock Alliance Roulette the same way if they wanted to—especially if more and more people abuse this loophole.
The reason that they don't is because Expert roulette is not done for exp. It can only be done at level cap. They want to keep these other roulettes available as exp options for people below the level cap.

As for Orbonne incentives, one thing they could have done is give us a weekly quest for i400 accessories like they did with Dun Scaith for i270 ones, which they strangely left out to my great surprise. Probably too late now for anyone to really care, though. I feel like they can't be terribly interested in incentivizing this duty or else they would have done it.