App Store forces me to verify my credit card every time I download an app.

Hello, whenever I download an app, it asked me to verify my Purchase settings. It does this EVERY time I download an app, and I'm not kidding. I don't usually download an app, usually 4-5 times a week. I am tired of of entering in my password twice and getting those annoying emails that alert me every time I do it, even if I didn't change anything. If this was to prevent people from downloading paid apps, then if they could enter the password the first time, couldn't they just enter it again and say done? Also, they would be able to see someone's credit card (if they had one), then they could possible change other stuff to it.

So is there any way I could make this happen less often? Thanks for you help.