Credit cards can pay *you* if you use them properly. I rarely use cash ever anymore. if they take plastic I use it. There is no point when you can earn cashback or other rewards when you use your card. Also it can protect your purchases and sometimes extend the warranty depending on the card benefits.
They key is to be responsible and make sure you pay your whole balance every month. This way you are not getting finance charge. This only works if you make sure you dont spend more than you can pay off for that period.
I earn 5% back on gas and other 'auto related' purchases on my 'gas card', and 3% back on another rewards card. If you use them for everything you normally spend day to day it really adds up month after month. I got over 100$ in cashback last year on one card alone.
Make sure to get a card that doesnt have an annual fee! 
PS360 ftw!
Currently playing..........
Gears of War 2, GTA IV Lost and Damned, Little Big Planet (Yes I said I had no interest but my girl wanted to try it and we did and now Im hooked 
)
