One of the things that cause distress among clients is the unexpected expense. I am sure you feel the same way when you have an unexpected expense for your car, like a dent in the parking lot from someone letting a shopping cart get away from them.
Look at a typical list of fixed expenses for a car. Most car owners pay them without questioning whether they need to.
When the expense is for something unexpected, like that dent in the side, the cost is much harder to accept. Even though it’s similar to what the owner pays each month without questioning it.