gerryniswonger: The bottom line is, there must be something else to putting that the players consistently shooting in the 50's have figured out that I need to know.
So I've been reading this thread for a while, and learned some very interesting stuff. Yeah, I'm at Champion Tier, but that's more perseverance than skill. If ya keep plugging away, you'll get there.
Anyway. My rational answer is that the real key to putting doesn't have much to do with the putter (in general.) It has more to do with the approach shot. Get it close and have shorter putts.
Checking stats on some of the greats reveals average distance to hole on approach under 10 feet. Since this stat goes back to hack days, that's pretty impressive. I note that you and I are at identical 13 feet.
So, it looks like your original concern is absolutely correct. There isn't much use in practice putting except maybe to get better at elevation effects.
Just my 2 cents and maybe hogwash. :^)