We all have made or will make such choices.
You argued that you belief yourself to be a rational person who takes logical decisions. That almost implies that you belief your decision not to pursue coz of your feelings towards the dealer, was not a rational decision.
Well my friend, I can assure you, you’ve made a rational decision not to pursue based on an emotional interpretation.
A decision is never 100% rational nor 100% emotional. Simply because that’s impossible unless you’re a robot or you’re conscious brain is deleted permanently (in which you wouldn’t be buying a watch).
Here is my view: in our decisions we look at several factors, numbers, values, average depreciation, liquidity etc etc.
But then our brain starts doing something magic. It takes an emotion linked to the subject, and it actually values the emotion and rate it as if it was a mathematical number. It’s then added into the equation with the other numbers et voila.
What we call “rational decisions” are actually equations with low rating factor for emotions. And vice versa.
Ok still with me? Let’s go back to your potential purchase. All numbers were looking good and getting even better.
Yet the behavior of the trader hit a nerve with you? And be thankful for that because it triggered an alarm bell that you will not ever trust this trader again with any purchases. The monetary discount he offered you, did not compensate the big negative number associated with “not liking, which is probably low factor” to “”he tried to screw me so don’t trust him anymore”. That’s a show stopper for any sale or purchase.
Apologies lengthy explanation but this topic is one I’ve studied many times over many years (no Phd staff far from that bachelor at best)
Hope it helps you finding the answers you’re looking for