I actually learned a tiny bit about something called DEBT TO CREDIT RATIO...
When someone has, say 3 cards with say, $2500 max limits on them, and let's also say they are new to the game and so they cannot really get more than about $8,000 in credit anyway... Now, if they cancel one of these, they just freed up $2500 of their "available" debt that they can have for themselves...
So if you cancel a card it's not always a bad thing. Also, if you do so, just keep notes on why you did so. It may say CANCELED AS CUSTOMER REQUEST on your credit reports. You can also write a max. 100 word statement about your own issues that can go into this report. It is a bit of copy editing and I know that of the 3 main Credit Reporting Bureaus, Equafax makes it harder to write this statement that the other 2. You have to go back and forth with them til they accept what you wrote. They wont tell you how to fix it, but they will tell you when it is wrong. They suck like that, but so be it. I was told to take it up with the FTC. I did.
BTW, the part about the writing my 100 words, I did that part. My limits of credit are higher than just $7500 but that is an example.
Hope this helps someone/

MM