Auto Car Broker In fact, there are thousands and thousands of used cars out there every day waiting to be sold by private owners, (with these owners often frustrated at not being able to find a private buyer), and thousands of dealers throughout the country who are desperate to source cars every day to fulfil their business sales targets, as good-quality second-hand / used cars are their 'bread and butter'. You might think it's only the big car dealership chains who make all the money when cars are bought and sold. But nothing could be further from the truth. The opportunities for earning good commissions from car broking are only limited by your own ambition. But like anything worthwhile in life, you've got to know what you’re doing, or you could miss out on some good potential commissions.