Good use cases - 1. Use against your keywords competitors with Adwords and get them kicked off. Now that's Black Hat. 2. Dilute traffic 3. Boost your rankings on banner networks There is a #4, but it's dumb. Faking alexa results to sell the domain for more? It seems like a lot of work for an essentially shitty con. I'm just getting into this stuff, but say, looking at godaddy domain auctions, I can easily tell which sites have fake states inside 3 google queries. I am willing to do some pretty black shit but yo this is just a slimy, unsophisticated con.