I think all of this authorization limits is nonsense. What if you have more then 5 computers? What if you account all the computers in your home, plus the one in your work, and the one in your holiday house or something that will account for more then 5?
Also, there should be an option to LIST all the authorizations that computer has. Or will you have to remember you authorized your own account, plus your sister's for some reason, and your naphew's or something?
As has already been commented, there is always the possibility of windows going kaputt, or your HD doing so, or your laptop being stolen or something.
This is all ridiculous!