Hi
how much appreciated value depends on the category and then specific domains
also depends on "timing", as in when you sold it or didn't sell.
also depends on when you bought it and how much you paid.
like when chips hit the fan and prices increased on 4 letter/number domains down the extension line, as volume peaked....
but after chip trend faded, value deflated and prices dropped.
or
take 3 character.com and 3 letter org
when I started domaining, one could register 3 char for $6.95 and 3 letter.org were about $20 average reseller price.
now in 2020 both categories have had sales in 4 figure and some 5 figs ranges.
they have been more stable than chips, in comparison to fluctuating values.
and then again, it all depends on how much a seller can sell a domain for, that raises the appreciated value.///
some folks don't appreciate what they already got now. cuz dey flip too fast to find out
imo...