My first computer was a Desktop, long before the arrival of modern day sleek laptops. My love for my first computer and my refusal to sell it off even to this date, explains my irrationality around my first computer.
Research has proven that sellers irrationalize the value of their own possessions much more than the buyers perceive.
My love for my first computer and irrationality around wanting to sell it off to buy a newer sleek laptop explains this quirk.
Dan Ariely mentions at great length of this and other irrational quirks in his wonderful book Predictably Irrational.
Read this wonderful book to be enlightened on such unknown peculiarities of the human mind.