Some models simply don't sell very well. Most all the touring models are always harder to find, are the first to leave the showroom floor, and are just simply more in demand. "Baggers" sell better than Dynas, Softails, Springers, Vrods. So, Road Kings, Street Glides, Ultras, and Road Glides are the "hot" bikes in the CVO lineup each and every year, with the SG's and the Ultra's leading the way.
I personally have seen some of the CVO Dyna models sit on showroom floors for over a year, finally being discounted just to move it. Same for the couple of Springer models they put out...and Softails. The '06 SEVROD I bought in August of 2007 had sat for well over 10 months, so they were willing to "deal" on it. That same dealer was, at the time, asking, and getting, 2K OVER MSRP for the CVO Ultra models. And people were buying them at that price as fast as they came in.
Worth more? If it's hard to sell them when new, demand is not going to increase when they are 10 years old. Any HD bike, no matter which one, is worth what the book value is, regardless of what's been done to the bike to make it "better". There are exceptions, of course, but the seller has to find that buyer who is willing to pay over book value because he/she just happens to love what you've done to the bike. But that's not the rule. I've sold three CVO bikes since '06, and none of them fetched a price over book value, despite the fact that I had done exhaust/intake work, upgraded suspension to the level of the best out there (to the tune of $2000 +), improved lighting, etc. It might have made them SELL better, but they didn't get MORE valuable in any case.
Perhaps at some point down the road...say 30 years away...a given CVO might increase in value due to scarcity, but it's more likely the value will simply bottom out at some point.
The CVO baggers are HD cash cows, and that is unlikely to change anytime in the near future. It ain't marketing, it's simply demand, IMO.