It makes a lot of sense... to a certain extent. Imagine if you had a Ferrari dealership and one of your salespeople came into your office and told you this
Him: boss, I just sold an 812 gts to a client and took in his old Ferrari as a trade in, the contract is signed, what do I do about the money transfer, what account do I use?
You: how much does he owe us?
Him: the client? nothing, we owe him $49,620,000, I took in a 250 GTO... so, what account do I use for the transfer?
Exactly that... im sure the as long as they value of the trade in gives them enough room for some decent margin when the sell the used watch the ADs are happy. its why PCP finance plans became so popular in automotive and why loyalty bonuses are offered.
AD makes initial margin on the sale for the original car, and sell a warranty with it for 3 years that requires annual services at your AD only.
you then make more money on the car at annual services, but it also gives you a touchpoint to talk to the customer annually.
at some point its worth valuing their car against the current model line up to see if they would be interest in trading in. (this is work finance works with the guaranteed value at the end)
at this point you could theoritcally trade their car in, and sell them a new car
you then make margin on the new car, the sale of the used car once sold.
this means from the original sale you have made 2 new car margins, a used car margin plus profit from the services, from effectively selling one car or unit.
theres an argument that this could work with a Rolex AD with CPO.
They could sell less desired watch on the basis that they will get a customer a pepsi in 3 years for example. however they are told they can trade in the less desired watch at the time
customer says yes and buys two tone explorer for example, AD makes margin at this point.
3 years go by (assuming they can get the pepsi!), and they take a trade in for explorer and offer a price slightlylower than current market value, and put that against the purchase of the pepsi.
they then make margin again on the pepsi.
they can then also sell the explorer at maybe a little premium than market value due to the fact its part of the CPO programme and not a grey retailer. at this point they have made 2 new watch profits and the used profit form the explorer.
customer gets the pepsi they wanted
used customer gets an explorer they want
retailer takes 3 lots of profit.