There's obviously a benefit to being able to quickly pay for gas with your credit card at the pump...no problem. But if you want to fill up and you know approximately how much to spend, why not just let it be what it comes to, without having to press a number above what you anticipate?
Also, by being able to easily fill up without using your credit card, it forces you to take a break by going into the station to pay. This is particularly important for longer driving times. You can have a coffee or bottle of water, etc. say "hope you are having a good day" to the immigrant behind the counter making a measly $15 an hour trying to feed his family. Now you have given yourself a rest, are healthier for being hydrated, and made the world a better place by interfacing with your fellow man.
Also, the person, who owns the gas station, can offer you cheaper gas with the money he has made selling you the coffee and water.
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