thread drift - I have a used (rare) Australian LP I paid $1 for in the 70s (I liked its pretty cover which is why I bought it & ended up loving the songs, too) which is apparently worth several hundred today. A pristine copy of the same album was worth $1500 in the late 90s, & a pristine copy sold for over $4000 a few years ago. (Hush by Extradition)