1) I have nothing to hide.
2) If I don't sign it they'll think I'm hiding something and that puts up a red flag to them and they'll move on to the next candidate.
You do know that every time someone checks your credit, that an "inquiry" is placed and drags down your credit score don't you? Most background checks include credit checks. I do not wish for multiple inquiries. I only want the employer that I am interested in to have this information. An interview is a two way street. I'm interviewing them as well.