Soliciting citations
I imagine that it could do wonders to your citation count


I honestly can't imagine that an unsolicited request to cite a paper actually generates enough citations to matter much.

I don't engage in this practice myself, and my response would be a cursory glance at the paper to see if it was essential (though the email should have articulated this) followed by either thanking the person for bringing it to my attention, or far more likely, simply deleting the email.