I have never had more than three cameras at any one time. When working as a newspaper shooter, I always had two of the same bodies (whether film or digital) usually with a wideangle zoom on one and a telephoto on the other. For me, it allowed me to really get to know a particular system and its performance under various conditions. Now retired, I have just a Fuji X100S with the two conversion lenses and a Yashica Electro35 GS with its conversion lenses. Been thinking about a second Fuji X100S so I can permanently mount the TCL and WCL lenses.
Yashica Electro35 GS, Fujifilm X100S (both silver & black bodies), TCL-X100, WCL-X100, sold everything else!