There's never to much cameras!
Currently I have 10 cameras running.
I have a few (more than a few) that I haven't installed yet, but when I finally will install them I'll be running 18.
And.. That's my next 'problem' as my NVR only has 16 channels.
So, i'm looking at either buy a 32 ch NVR or to start experimenting with
Blue Iris.
In my case I mainly use the cameras to see what's going on on my little farm, to see that the animals has water/food and to make sure they're where they should
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
My wife loves the cameras as when she's in the bed at night and hear noise from the stable she no longer need to either worry about it/ or o out and see what's going on, just pick up her phone and check the stable cams.
Edit/Addition: I'm a Dahua guy and so far my favorite cameras are the SD59432XA-HNR that I've been running since a year, a few weeks back i also picked up the 7442H-Z4 - to describe it in short its just Insane! =)