I don't know how many cameras I have, actually. More than 10, less than 20.
But I only regularly use about 5. 1 x LTM rangefinder [was a Zorki 2C, now a Leica IIIc], 1 x dSLR [Samsung GX10], 1 x Olympus mju II, and a couple of medium format cameras [Salyut-C and Fuji GS645S].
I'm selling off almost all the cameras I don't use as part of a ruthless clearout. The plan is to get to down to those 5 plus a spare LTM and spare K-mount body.