I believe the 2018 prices are so strong, because it was a 1 year offering, and everyone wants one (when shopping for the OG). If I hadn't gotten such a good deal on my Comp, I was going to buy an LCI, no questions asked. Most other people in the used car market are the same, if they're going to get an OG, it has to be the LCI. And while the 2018s sold the best out of all the OG's, it was only ~2800 total for the US & Canada, and almost a 50/50 split for MT and DCT. Not a common car... A little over 9 M2's per 1,000,000 people in the US.
*If you're interested,
HERE are the break-downs for year, tranny, options, and color*