Because most services which accepts bitcoin now are not asking about my name, address or credit card number.
In addition I am sure that no one will hack their data base and steal my personal data, credit card and use it later.
You have a good point there. Everything you wrote is truth, and i agree with you totally. In my environment i know only two kind of people, those that are paranoid about there personal info, and those who do not care enough about it. But i think that their are bout wrong things to do. Personal information have great deal in day to day life, and it could lead to even greater scams. It is important to keep it as secure as possible, like you said.