small kid

My sister came home last night with her kids and we started playing with her kid. When my sister was purchasing things for home she gave her credit card. After reaching home, her kid started crying for the credit cards to give in his hand. It was not possible to console her at as she was very much small. We feel not to hurt the kid as the kid doesn't know anything at this age. She showed her credit cards, and I asked her why did she apply for those many cards when one is or two is enough for a family. Then she told that many of the customer service guys were keep on calling her with many options and so she applied for it. But she doesn't uses all the credit cards that she have as don't want get confused of what cards she is using for her purposes. When any service people calls me, I never encourage them to call me again for application of new cards.