Share your insights or perspective on the financial matter presented in the input.

Is keeping old credit cards and opening new credit cards with high limits and never using an ideal way to boost credit scores?
Your plan will work to increase your total credit capacity (good for your credit score) and reduce your utilization (also good).  As mentioned, you will need to be careful to use these cards periodically or they will get closed, but it will work. The question is whether this will help you or not.  In addition to credit capacity and utilization, your credit score looks at things like These factors may hurt you as you continue to open accounts.  You can easily get to the stage where your score is not benefitting much from increased capacity and it is getting hurt a lot by pulls and low average age. BTW you are correct that closing accounts generally hurts your score.  It probably reduces average age, may reduce maximum age, reduces your capacity, and increases your utilization.