Well, after reading this it seems they should do an edition like Clark- collecting their remix stuff on four slabs of vinyl, but on the other side that would shorten the amount a bit. Some of their remixes are really long.
Talking about rare items, I made an exceptional cheap buy for the Buck-Tick remix comp that came in a book (and features great reworks by Aphex and R H Kirk too). The book is nice, typical rotten polaroids and close shots of faces or dissolving colours on manipulated picture material. Worth to get not only for AE.
Years later I read in the german mag Raveline an interview with Autechre, stating that Buck-Tick gave them four grands for the remix They said it was the best paid remix job they had at that point.