I tend to keep them. I still have my old i3 I dropped and bent a corner. It still works though, I just need another LGA 1155 system. My initial plan was to slowly upgrade my whole system and eventually end up with 2 systems, my first system with the exact parts list, literally every original part, and then have my main system. Instead what I'm doing is upgrading my system bit by bit and having the original case, and thats about it. I'll then find another case, gut it, and put all my old parts in it. Then build a system out of the other hardware.