I don't understand how you can have 3 or 5 of the same card --- will they let you apply for that many of the same thing? Or are they different types of credit cards from the same company? And they give you the sign-up bonuses for all of them? I have recently signed up for a lot of credit cards, but I didn't think you could sign up for so many of the same kind (like 5x United CC)? I guess I'm just a scaredy cat in applying for more than one of the same card --- but I'm not sure what I'm exactly scared of here.

Also, I keep getting "business" credit card applications, but I work for a big company (not a home business or anything). Can I apply for a "business" credit card or do I need my own TIN and company name, etc?

Thanks! You guys are the absolute best! I don't travel for work anymore at all, and I'm definitely earning more FF miles than I ever did when I actually flew!