You're right murdoc! And some dealers do sand them before selling. However, I still prefer it not be done prior to selling to ME. Maybe just a little to remove the very sharpest of it(which I think may already be happening), but I prefer to be able to give the board edge the finish I want by being able to sand on it. If they come already sanded too far, you can't do this. But, like I said, to each their own.
Sharper edges have their uses too don't they? Bet I can hold my edge better with a sharp edge than you can with a round edge when we ride over top of that exposed sandbar out there. Or how about when you ride up ON TO the(deserted)beach and then turn to ride back out into the water...I bet I hold my edge better with a sharp rail there as well. OR, suppose I am setting on the beach, board on feet, getting ready to power the kite up and jump and (hopefully) land in the water...wouldn't a sharp edge give me a better bite in the dirt while my kite powers up? Not that I am trying to justify riding on land, jumping from land or anything, but...well...you know.
They don't need to be razor sharp as you have said...they just need to be thin, and to be honest with you, the last few skate boards that I seen come from slingshot DIDN'T have the sharp edges that they were known for. I mean, they weren't round, but they HAD already been sanded down a bit.
OH, another use for my sharp rail(when I had it)..I once used it to cut a line in a bad situation when a slack line ended up around my leg and the kite was beginning to repower when I had nothing else to cut it with. SO...can't I now honestly say that a sharp rail on the kiteboard may have very well saved my life?
I'm not trying to bust your balls bro, I'm just playing here. I agree with you, they should be thin, but not sharp. They should prolly also be sanded a bit prior to selling as you said. But, for the record, a really sharp rail once did save me from a potentially nasty situation...that part is true. Of course, those same sharp rails cut my hands a couple of times (prior to sanding) doing board grabs. That's what finally motivated me into sanding them down a bit.