First barrage with the dealer

How do you want to define what a dealer makes on a sale? Say the dealer paid $40,000 to the manufacturer for the unit. If they sell it for $45,000 did they make $5,000? I would say, not even close. Because out of the $5,000 they have to pay the sales person a commission, usually around 25%, that leaves $3750.00 But wait, on top of the commission, the dealer has to pay FICA taxes, unemployment insurance, workman's comp insurance, possibly a 401K match and other benefits, so that will likely run up and additional 20% to the cost of the commission, so take $250.00 off the profit. Apparently there is a sales manager, so he gets $250 net off this sale. There are support people such as receptionist, title clerk, accounting department etc. Say they all cost $250 more. We are down to $3000.00. Land, buildings, utilities, the guys who clean the rigs, surely add another $500.00 to $1000 to the cost of a sale. Split the difference to $750.00 and we are at $2250.00. State and local income taxes for the dealer probably are $35% at a minimum so the dealer is making less than $1500.00. And I bet all those cost figures are on the low side and the original gross profit is greatly inflated. There is no way a dealer could make it if each sale only started with a $1000.00 gross profit before expenses on each sale.