2012 LE was a flop due to packet price and insert selection - those boxes have not held their value, nor have the non-numbered inserts.
2013 Elite was a good set with not too many inserts (great variation, numbered sigs, etc) but was stuffed up by poor distribution of inserts in packets - those boxes have not held their value though, but if you are lucky one box in 5 or so is a really good buy.
2014 Elite was spot on with inserts (except for the double // issue) and their distribution - those boxes have held their value (within $20-40 of retail anyway) and are STILL sought after. Hint, ESP got it right, don't mess with a formula that works.
2013, 2014 and 2015 Traders sets were mongrels to put together (more so '14 and '15) and boxes are really only worth $40-50 now, with the odd box (1 box in 2 or 3 CASES) having a chance of a card worth more than $50.
Hopefully 2015 Elite does NOT go the way of Traders re set size or box value, or regress back towards LE on price. It's not sounding like a winning combination so far though.