That means on a CRV, the Net profit (I think you meant the net profit), is $2,500. But the margin is more like 25% of the purchase price ($40,000 car means a margin of $10,000). Out of this margin must be paid the business overheads such as all of those admin people, the electricity, the rent, the lazy service department, the previously mentioned $2,500 profit etc as well as the retainers for salespeople.
The business profits by $2,250 after paying all costs and the salesman gets $250 per sale plus retainer, company car, petrol and bonuses for having a good month.
If it's so bad, why is there an endless stream of salespeople? Why would you do it? Maybe they should become highly paid professionals like nurses (3 years uni), teachers (3 years uni), firemen ( a few months training) and policemen (a few weeks training) or even lower paid professional like engineers ( 4 years uni) and architects (5 years uni).