If someone is choosing to spend their weekly loot drop on a job that they don't have unlocked, then more power to them. Its a huge waste for them and very few people would actually do that.
With the weekly lockout in place I don't see how someone could win 90% of the items, they get one per week. Unless you mean the older raids, in which case the gear is outdated anyway so is actually far more useful to someones desynth than the person playing the job.