Professionals like doctors, lawyers have plenty of cash to purchase cars
NTRO, CBI and the indian government allegedly bribed by google, tata have been mercilessly hounding indian paypal account holders, domain investors falsely claiming black money, when almost the transactions of the paypal account holder can be accurately tracked and they have no undisclosed income,
In contrast professionals like doctors, lawyers, chartered accountants, government employees receiving cash bribes are directly dealing with customers and have plenty of cash which they receive as payment, which they may or may not disclose depending on their discretionary powers
So most of the doctors,dentists, lawyers and chartered accountants have one or more cars, often high end models,luxury cars and periodically purchase a new car depending on their income
So in large cities, where dentists have a flourishing practice, the car dealers are often visiting the dentist clinic trying to sell their latest models of cars. Many of these professionals are paying at least part of the amount for the car they purchase in cash, and getting a cash discount.