I pay my bill every month on time....
....my Amex card gives me back around $1000 a year for the past 4 years or so.
I have no problem with credit cards so I hope nobody f***s with the system.
I carry only enough cash for an occasional cup of coffee and use my card for just about everything. I have paid $13 in interest over 7 years and buy almost no checks at the bank. Credit cards are great.