The guy pictured above did, primarily for lockout and grip strength (especially when using a thumbless grip) and credits his 800 pound deadlift to them. (Similar reasons Matt Kroc had for "inventing" Kroc rows. Let's think on that for a sec.)
I haven't used Karwoski rows (sometimes called "grip shrugs") but they seem pretty similar to "Haney shrugs" - behind the back Smith machine shrug/rows - just done in front of the body. As long as you don't get stupid with the weight and form, why not give them a shot for a few weeks and see how it goes.
Technique-wise, dude, it's a shrug variation. I can't imagine how you could be screwing it up that badly. Shrug, some arm pull, hold for 2-count, lower, repeat.
This is funny, and sad, and funny.
I hadn't caught any before but I just double-checked and, really, six different threads in six months all about back training. Everyone's goals are their own thing, but getting some perspective might be worthwhile.