Yes, some people probably will always want a newer car. But even if you do an extreme example of a car wash every week ($15x52 weeks = $780 per year) that’s less than 1-2 monthly payments(average $716/month for a new car, $526/month used), not counting taxes and registration, higher insurance, etc.

https://www.nerdwallet.com/article/loans/auto-loans/average-monthly-car-payment