Oh and I had a very similar lunatic ringing me on a £10,250 C250 estate last week. He had a BMW X5 in chop, sounded nice, pan roof and 20" wheels, M Sport, over 100k on it but still, not the worst swapper I'd ever see I expect. Without valuing it, I asked what he was looking for out of it and he said "well, I've seen them going for £10,500-11,000 on Autotrader...." so I said well, expect to see around £2000-£2500 less than that as a trade in but please, let me have the reg and I'll do some research and come back to you with the best price I can.
5 mins research, an HPI check and I'm at £9k, so my off-the-cuff assessment to him was right. I call him back, willing to go to £9500 if it's very tidy and I have a good margin in the outgoing car so I'm happy enough with the deal at that price. I tell him the "good news"
"No no, that's miles away from where I'm at, not interested"
"Sorry to hear that, may I ask what sort of figure did you have in mind?" I ask.
"Well, I was expecting at the very least, you to offer me a straight swap. You have the profit I'm sure in the Mercedes, so it would make sense for you to do a straight swap"
"Ok, well whilst I can see how that is attractive to you it means I am having to value your car £1250 over it's worth and I have to sell two cars to make one cars' worth of profit" I state.
"No no" he continues, "you still have the profit in the Mercedes so you're not losing out"
"Hmm, well that means the profit from the Mercedes in theory transfers to your BMW, in essence, and that means I'm having to sell two cars, the Mercedes and your BMW to get my profit, the profit on one car, meaning I'm standing to make nothing on your BMW, which with respect, isn't attractive to me given it may take several weeks to sell your BMW, as nice as it sounds"
*3-5 seconds of silence as it dawns on him his maths is so bad it's embarrassing*
"ooohh eeerr...no but...errrr" he stammers
"I'm sorry we couldn't make a deal" I interrupt to save his blushes "but perhaps it may be better for you to advertise your car privately and give me a call when you have sold it and we can get you in this fine looking Mercedes I have"
"Yeah, exactly what I was going to say" he lies on "I will sell it privately, that's what I'll do. If I'm still interested I'll ring you back and make you an offer on the Mercedes"
Don't bother I thought.
I sold it on Saturday, full asking price to a sensible bloke who could add up.
I don't know how some people survive in the world.