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Is keeping old credit cards and opening new credit cards with high limits and never using an ideal way to boost credit scores?
Problems with your plan (in no particular order) there is a limit, once they have decided that you have enough credit they won't offer any more. If the economy changes (like it did in 2008) they can reduce the limit on existing accounts. If you don't use them, they may decide to close them. Using existing cards will encourage the bank to increase the limit on that card. opening cards can make some lenders nervous. Having a new card close to when you are applying for a mortgage or a car loan can make them less likely to lend you the max. You have to decide: Are you trying to buildup your credit limit? or your credit score?