COSTCO offers an American Express card service that gives 3% back on purchases at their gas station. I applied for it and was approved. The ONLY reason I had to do that was to get the 3% rebate on my gas purchases. For one year, I went out of my way (about a mile) to fill up EXCLUSIVELY at COSTCO, because I wanted that 3% rebate at the end of the year. Eleven months after I started this program, I got a letter from American Express telling me that my account was being cancelled, even though I always paid my balance and did not owe... read full review »