you can use 100, she can use 200, but I also can use 113,225,326 etc,, why not...?
I believe the importance is whatever number you have developed, you have to stick to your rules......
If you think just a Simple MA 17 cross another Simple MA 103 can give u a signal correctly, most of the time,, just buy or sell every time on this particular signal, like a robot,, althought talking is much easier than execution...