All excellent points! Your #1 also is the #1 thing that bugs me out, although I suppose it makes my email management easier since I trash those pitches immediately. 

Particularly given that my name is at the bottom of every single post, and readily available one click away on the (prominent) about page, misdirected pitches show a complete lack of respect and failure to pay attention to obvious details. One would think *not* doing that is the first thing you learn in PR 101.