Living a frugal lifestyle, like dieting, requires some willpower. Once your will to pinch pennies diminishes, it's hard to continue. Face it: a spendthrift lifestyle is just plain EASIER. Unfortunately, a lack of certain set frugal habits can create "yo-yo" frugality - much like yo-yo dieting, where the same 10 kilograms are lost, and gained, and lost, and gained. Except in this case, it's the same 100,000 yen that is saved, and spent, saved, and spent.