Is it bad to add yourself as an authorized user (to get the 5,000 bonus points), maybe with a variant of your name (e.g., Bill vs. William)? Would the card then show up twice on your credit report? If so, is that bad (e.g., magnifies the effect of reduced average age of accounts, and looks like you have more credit available)? Or do people usually just put a pet's name, etc so that it doesn't affect your credit report? (I don't have a spouse nor kids.)