Actually those types of accounts can be helpful, if you already have high credit limits on other cards.
If you are building or rebuilding credit then they won't be much help in the beginning.
Those types generally report only the high balance, other creditors will not have a clue as to your real credit limit. That can be a plus.
If you are applying for a type of loan and the loan lender cannot see the credit limit then you probably won't get the "you have to much available debt" response. Some lenders mistakenly believe available credit is debt
The other good thing about those types of accounts is in the way they report. They don't report like regular credit cards do, as installment, they report as open. Some types may report as installment or flex spending.
By reporting as open, FICO ignores them as far as utility is concerned.
Those types of cards, and how FICO treats them, can
almost be considered hidden accounts. Not full fledged hidden accounts but almost like the step child of hidden accounts.
If you are building or rebuilding there are ways to show a one time higher balance over your normal monthly spending, though those ways are semi risky.
For example,
Do a balance transfer to your bank account and then pay the transfer off after the statement cuts. Problems could be if the balance transfer has fees and also if the creditor will allow the balance transfer to be deposited to your bank account while considering it as a balance transfer and not a cash advance.
Make a large purchase right before Chase reports. Then after it reports return the purchase and pay the card off. The problems with that is, timing the reporting with making the purchase and being absolutely positive that you will be allowed by the merchant to return what you had purchased with no problems and with no fees.
Order coins from the Mint, then cash them in at the bank and pay off the card. The downside, depending on the Mint to ship in a timely manner (which they
usually do), lugging all of those coins to the bank, making sure everything happens within the statement period so no interest will be charged.
Pay every bill with the card. Mortgage, utilities, car loan, etc. Just be sure that paying with a credit card does not incur a fee.
As I already stated, those ways do carry risks.
Never, ever do a cash advance with
any credit card you want to keep.
If you must do a cash advance, use a crap card that you don't care if the interest rate is jacked or the account is closed.