I think that these sets,despite their bad quality,are very rare and collectible!Nowadays they are sold in extremely high prices!For example one small box can be sold about 100 euros!If someone has photos of strange sets or catalogues,it would be good to help,in order to "complete" some "gaps" in the history of LYRA!!!!!!
What makes an item highly collectable is purely subjective to personal preferences, likes and dislikes. The fact that these sets are extremely rare does indeed make them highly collectable. But one must question himself, would I really pay 100 euros for something like the following?
Clearly the plastic is not of the high quality plastic a geobra produced set was or is, the accessories are cheaply made in the sense that they are not cleaned off plastic remains, arms are broken, and the horse is a completely different mould than the one shown on the box...
So for me, as far as collecting for the above item is concerned, someone would pay 100 euros because he or she used to have that set, it holds a sentimental value, a meaning, a childhood memory... These are all subjective reasons for collecting something, or just simply because that person enjoys doing so. Another case is unless that someone wants to preserve the history of a company and a toyline long gone, like you seem to be interested in doing, which is a very commendable effort.