I know of nine aircraft often found in very close proximity that don't seem to hit each other!
GPN01
If you are talking about gliders? they do have a high inter glider collision rate.
I have always been sceptical with statistics
start with only you in the sky and all you are ever going to hit is a bird.
Step up from that and the more flying objects within a given space means the more chance of a collision.
Vary the speed of those flying objects and their own unique design ie high wing low wing small windows etc and the chances increase again.
Ok there is always the chance that in the middle of no where you could collide with another aircraft but it has to be the more aircraft in a given space the more chance of a collision.
Pace