What is the point of purchasing more Packs, when most of the Artifacts are from the blue tier?
By acquiring multiple packs you will end up with many doubles from the blue- and perhaps even purple-tier Artifacts. You can trade-up those Artifacts for Artifacts of the next higher tier to complete your Collection. Additionally there es one Artifacts of a higher tier than blue in every Pack. Maybe you have some extra luck and draw a gold-tier Artifact immediately?