I like to do these. My grip is about an inch from the collars (is that what the outer part is called?). I like to use snatch grip deads as a supplimentary lift. I feel that it helps me with my squats, my deads, my lower back and snatches.
I squat very low and I like to have power at the bottom.
If I'm at a point where I'm at a plateau in my conventional deads and I can pull a certain weight to completion, but I add 5 lbs and I can't even budge the weight off the floor then I'll incorporate snatch grip deads for a few weeks.
I feel that snatch grip deads really help my lower back strength. Since I'm dropping lower to pick up the weight I have to not only squat lower, but angle my back a little lower to parallel to the ground as opposed to more upright. That also helps me concentrate on not rounding my back which I concetrate on very much since I had an injury to a disc and I'm susceptable now.
Doing snatch grip deads also gives me confidence when snatching. It makes the first pull soooo easy and I can focus my thoughts, power and form on the second pull as I'm not wasting energy on the first pull.
Just some thoughts.