There are plenty of reasons why it's good to have a good credit rating. At Capital One, we use your credit rating to decide whether we can offer you a card, and once you're a customer to decide whether to offer you credit limit increases. Every few months we check whether we can do this for you, and will increase it if we can. After one year you could receive other upgrades as well, like cashback rewards.
There are other benefits too. Many 'day to day' products that rely on a contract, such as mobile phones, are also affected by how well you look after your credit. The better your credit rating, the greater your financial options will be, like being able to apply for loans and mortgages.