This seems like a bug to me.
Timed Magnetic Lure fishes up a disproportionate number of rare artifacts. When fishing with it, I end up with a stack of blue and green fishing artifacts and see very little common fishing related artifacts. This is especially problematic because each set contains many more common artifacts than rare ones.
And I want to clarify this isn't a run of luck. I've seen this issue over all the fishing zones with many 100 artifacts fished up while using the Timed Lure. This is also reflected in the Auction House prices. Where common fishing artifacts sell at 10 to 100 times premium in basically every set.
If anything the opposite should be true or even better the drop rate should be even across all possible fishing artifacts.
Please address this.