I have close 1500 kits and countless more templates. Now about 100 or so of those are my own kits or collabs I did but the rest...purchases or creative team freebies. I have them organized. My EHD is 5 TB and it is half full. I keep my kits on it and my photos etc. I also have online back up. I did purge a while ago but only kits that were super old, out of style (mine and just in general). For the most part, I keep everything! I can't get rid of things.
My kindle library is similar with over 150 books...EEK! I am a digital hoarder.