The Cost of Being Poor is a well known comparative study of the urban poor in Indiana, United States that addresses this directly. There have been numerous others.
These are people who definitely could not get together the $8,000 for a 7 year old car in good condition, or get a loan at all besides a Payday one. They live paycheck to paycheck.
The question is not just a quantitative one of the car cost, depreciation, years of use. It’s a qualitative one, as in quality of life. A poor person who can only afford to take the bus loses time sitting on a bus instead of grocery shopping, taking care of their kids, etc. and needs to exert mental energy to plan their day around bus rides and schedules. They generally “pay” in numerous ways besides the pure value of the vehicle vs. some other more expensive vehicle. Above all, they pay in mental bandwidth. They spend most of their mental energy worrying, planning, and stressing about being poor. That distinction can help clarify this argument a lot, and that old boot example doesn’t capture that.