I don't think LE really means anything really. I take it to mean that the seller thinks it's nice, that in his opinion it's a limited edition, and they're going to want more money for it
Now if it's a named coral that's different. If some one advertises for instance a "Tyee Retired LE Eddie’s Purple Monster" I can Google or do an RC search to find out if it really is a collector's coral. I can find out that a "Lime In The Sky" has a waiting list almost 2 years long at Frag Farmer's. This adds value to a coral IMO, and will influence my decision way more than "LE"