Interest...MAKE IT WORK FOR YOU!!!
This right here has caused more people to go bankrupt and many other to become filthy rich.
Let's say you max out your $1000 credit card, then just pay initial minimum payment of about $25 dollars at 18%(nominal, I'll talk about this later). If you continue just paying the initial minimum of $25 it will take you 62 MONTHS to pay it off!!!
You would owe the credit card company for over 5 years.
But in turn if you start saving that $25 a month, at 6% interest compounded monthly, at the age of 25 and continue until you want to retire at 65 you would have around $49,800 in the bank from that!!!
So like those people helping Ethiopian kids, if you will give less than one dollar a day (but to yourself) you will have about 50 grand in the bank after 40 years.