I have 5 working ps4 controllers atm. 2 at launch, 2 extra, another one came with the pro.
4 player co-op games are awesome.
I've had 5 Wii/U controllers, only 3 working left. (plus gamepad, balance board, 2 nunchucks, classic controller, 2 motion plus sensors)
6 ps3 controllers, 2 barely working left, shit build quality.
2 360 controllers, they're build like a tank, but got far less use as well.
Don't remember the rest, yet I didn't have kids before ps3/360/wii so no need for more than 2. I did go through 3 of those plastic dance pads for DDR.