Regardless of what the “rules” may be, it is very easy to get credit privileges well over your annual income. I once had 15 major credit cards and credit lines (mastercard, visa, american express). One day I added up total credit available (used and unused) and was awed to discover that I could charge over 4x my annual salary. I was further amazed when I sat down and calculated my credit card debt that I owed 1 1/2 times my annual salary (gross).
It is very easy to get “lost” in debt when you have numerous credit cards. People tend not to add up all those balances; just pay the minimum due every month. Another thing people tend not to notice is that the finance charge usually eats up most of your monthly payment. If your monthly payment is $100, the finance charge may be as much as $95, so you are only lowering your balance by $5 a month, keeping subsequent finance charges high.
Ten years later, I am still paying off one of those accounts. It’s been a long, long haul, but I am learning to live without credit cards. I now have one credit card that has a $300 limit, one woman’s clothing store card with a $400 limit and a major appliance store card with $3,500 limit. Most purchases go directly against my checking account. You’ll be surprised how much disposable income you have once you’re not paying a lot of credit card financing charges!
It’s difficult to separate what you need from what you want when you’re used to throwing stuff on credit cards. You don’t “plan” purchases anymore or save up for a purchase. Throw it on a card and make the monthly payment. I can only hope I don’t get sucked into doing that again!
Back to the OP’s question…I never found having so much open credit ever adversely affected my ability to get more credit. Pre-approved credit card applications arrived in the mail almost daily, and anything I wanted to purchase otherwise got automatic approval (i.e., store credit lines, etc.). The only asset I own is my home, so it’s not as if there was anything to “attach” if I defaulted.
My guess is that there are many more factors in deciding your credit rating than how many cards you have or what your credit availability may be and it’s difficult to say which things might take priority. Stability is probably major - work history, whether you own or rent, changes of address, as well as your “payment on time” record.
One thing you might consider if you don’t want to get rid of your “extra” cards is to call the banks and ask them to lower your credit limit. If they refuse, cancel the card. A low-limit credit card can serve as a buffer against an emergency expense, or to use for online purchases if you are leary about using your debit card. It also prevents you from racking up another big balance that will have to be transferred in the future.