Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

Do I even need credit cards?
Credits are expensive, so it's a great advantage to pay in cash. Obviously, it's even more an advantage to pay in cash for a house or a car, of course if you can afford it. But, as annoying as it could be, there are some services, where you're out of option to pay in cash, or even to pay by bank transfer. One of the most prominent examples, Google Play (OK, as I've learned, there are prepaid cards. But Groundspeak, for example, has none.). With the further expansion of Internet and E-Economy there will be more cases like that, where paying in cash is no more an option. Booking of hotels or hostels is already mentioned. There are some that provide no other booking option that giving your credit card number. However, even if the do, for example bank transfer of, say, 20% as reservation fee, please note that international money transfer can be very expensive, and credit card is usually given only for security in case you don't come, and if you do come and pay in cash, no money is taken = no expensive fee for international money transfer and/or disadvantaging currency exchange rate.