Splintering this off from the discontinued-prices thread...
There are clearly sets that are considered fun to build, but for whatever reason, don't seem to appreciate after they're discontinued. The Star Wars "Home One" set seems to fall into this category, and it looks like many of the PotC sets will as well.
What other sets and themes fall into this category? (And are therefore worth looking into as a collector who is looking for fun stuff to build but doesn't want to pay huge premiums above the original RRP?)