I would guess the per unit margin on LE's is a good deal more than on a Pro. Just based on the MSRP difference of 1500-2000. There isn't that much more machine in an LE, there's probably a couple hundred bucks more in parts and a few more hours of labor. Development cost difference are a bit more cloudy; either they pay more to decontent the original design to pro level, or pay to content up a Pro.
And the demand created by artificial limits probably sells more units than if they sold them as premiums. Plus they can forecast resource allocation better, which has a reductive effect on cost. LE's move pre-orders, premiums not so much because the perception is 'unlimited, I can wait'. When in reality all a premium is is a limited run where the limit isn't announced. But ultimately they don't keep making them to meet demand. If the promise of a non-LE was truly unlimited, they would still be running Tron Pro's.
The reality is that Gary, and maybe to a larger degree his investor are still trying to figure out the most efficient way to make money. So these inconsistencies around pro/LE/premium appear to be some thrashing as they work their way along the learning curve to that golden formula that will most efficiently move our dollars to their wallets.
My $0.02 anyway.
Also, I'm in for a Good Guy LE, SNIKT SNIKT!