I had over 800GB of loops at one time that I cut down to under 400. I never keep those on a SSD drive. With Producer Loops stuff you can reduce their size by removing the loops labeled WET or TAILs. I always compress the full mix loops to mp3.
Usually when ADSR would have like 15 packs doe $20 that the total size is around 2GB those seem to be most useful since they come with midis and presets.
Unfortunately I've moved on to collecting numerous presets for all of the synths I have.
I've moved on from synths made in Kontakt. With Spire, Serum, Phaseplant, one could create without using up drive space.
Drive space is cheap when you don't have to buy it.
BTW CM magazine has reviews of sample packs. Anything rated under 9/10 is mediocre.