I had posted a picture of the killed deer I found on Saturday. Then I placed my cameras on it and went back every day to move them as every night the mountain lion moved it a few feet. So it is not activity that just happens in front of the camera.
Other good pictures I have gotten were because I spent a lot of time studying the trails and how animals climb up from the creek to the ridge.
All that and luck. But no. Trail cameras do not attract activity, on the contrary.
There has been no random placement of cameras, that's for sure. If you knew how much time I have invested into this you would not be saying that. I find your post a bit of a put down.