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Why would anyone want to pay off their debts in a way other than “highest interest” first?
TL/DR  Yes, The David popularized the Debt Snowball. The method of paying low balance first.  It's purely psychological. The reward or sense of accomplishment is a motivator to keep pushing to the next card.  There's also the good feeling of following one you believe to be wise. The David is very charismatic, and speaks in a no-nonsense my way or the highway voice. History is riddled with religious leaders who offer advice which is followed without question.  The good feeling, in theory, leads to a greater success rate. And really, it's easier to follow a plan that comes at a cost than to follow one that your guru takes issue with.  In the end, when I produce a spreadsheet showing the cost difference, say $1000 over a 3 year period, the response is that it's worth the $1000 to actually succeed. My sole purpose is to simply point out the cost difference between the two methods. $100? Go with the one that makes you feel good. $2000? Just think about it first.  If it's not clear, my issue is less with the fact that the low balance method is inferior and more with its proponents wishing to obfuscate the fact that the high interest method is not only valid but has some savings built in. When a woman called into The David's radio show and said her friend recommended the high rate first method, he dismissed it, and told her that low balance was the only way to go.  The rest of this answer is tangent to the real issue, answered above.  The battle reminds me of how people brag about getting a tax refund. With all due respect to the Tax Software people, the goal should be minimizing one's tax bill. Getting a high refund means you misplanned all year, and lent Uncle Sam money at zero interest(1). And yet you feel good about getting $3000 back in April. (Disclosure - when my father in law passed away, I took over my mother in law's finances. Her IRA RMD, and taxes. First year, I converted some money to Roth, and we had a $100 tax bill. Frowny face on mom. Since then, I have Schwab hold too much federal tax, and we always get about $100 back. This makes her happy, and I'll ignore the 27 cents lost interest.)  (1) - I need to acknowledge that there are cases where the taxpayer has had zero dollars withheld, yet receives a 'tax refund.' The earned income tax credit (EITC) produces a refundable benefit, i.e. a payment that's not conditional on tax due. Obviously, those who benefit from this are not whom I am talking about.  Also, in response to a comment below, the opportunity cost is not the sub-1% rate the bank would have paid you on the money had you held on to it. It's the 18% card you should be paying off. That $3000 refund likely cost over $400 in the interest paid over the prior year.