I completed this run about 12 years ago. I found this article at The Cardboard Connection site on the Tiffany sets interesting:
http://www.cardboardconnection.com/c...baseball-cards
Some 7-10 Years back the 86 Traded Tiff set was all the rage(Bonds RC), and 12-16 years ago the 85 Regular Tiffany set was the set to have due to its star and HOfer RCs. The 85 set (sealed) still pulls $500 a set...still the most valuable of the Tiffany sets. The 86 Trd set is still a $300+ set sealed. The 84 regular Tiff set sealed has recently sold for $400 +/-.
IMO, there is much more value is in these Tiffany sets if they are still factory sealed versus unsealed.
As far as singles, star cards that are higher end graded cards pull obvious premiums over their non-Tiffany counterparts. For whatever reason, Tiffany commons are not worth much more than what their non-Tiffany counterparts are worth despite their low print runs. I am hoping this changes as I have 4-5 near sets from each year (missing most star/RC cards).
As far as popularity, they appear to be popular when they are still factory sealed sets, and the star and HOFer player/registry collectors appear to find the Tiffany's popular.