actually just counted and I have 30 usb cables. I got them for 2 camcorders latest one uses usb charging and different one for data transfer, 5 iPhone, two ipod, one mp3 player, 1 isaw helmet cam, 1 dashcam, 1 head torch , iPhone docking station, nexus 7, Samsung tablet, 4 digital cameras, 2 mine 1 wife 1 daughter, 2 would you believe for adult toy charging, (not mine!!) 1 iPhone power pack, garming sat nav, scala headset x 2, and more I cant remember till I need them.
I probably do have over 50 from old phones and equipment as I don't throw anything (hoarder) but I only keep the ones I use ready to hand.
here's a pic as I detect some doubt (cant you tell i'm off work bored?)