LTO6 tapes are about $40 per tape (2.5Tb) when bought in bulk. Maybe $30 if you are really big. Hard drives are around $50 per 2Tb in bulk.
And that's without considering the cost of streamers (multiple $$$$), tape robots ($$$$$) and the storage software solution (shockingly, there are no good OpenSource hierarchical storage managers).
Of course, HDDs need some kind of SAN, but they are cheap these days. AoE/iSCSI solution for 1000 drives capable of 100Gb throughput can be bought for just under $30k and doesn't need any fancy software.
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