how on earth do you have 13 amex cards? even if you got 2 for each account for you and the mrs. (not possible on some amex cards) you would need 7. good grief
spg- 6 (wife, mine, business, auth users on each)
hhonors - 4 (wife, mine, auth users on each)
boa virgin - 3 (wife has 2 and I have 1)
I actually have 14 because I accidentally requested 2 auth user cards for me on my wife's account and they sent them both to me and let me activate and register both of them.