GAS vs LBYM
Gear Acquisition Syndrome allowed me to attempt to explain the 'why' and 'how' of LBYM to a friend. I failed.
I ran into him one morning at a coffee place near the only photo shop in town. He reads my blog, and so commented on my recent annual cost of living in Thailand post. He knows I turn 62 this year and intend to delay taking SS until I'm 63, but doesn't see why my reason would be sufficient (It's to maximize a Roth conversion without going over 15% bracket). Finally he has long since figured out I must be LBYM because my non-trivial splurges, e.g. I flew business class to Europe for the first time, didn't fit with the rest of my spending habits.
I accompanied him to the photo shop. The Pannasonic / Leica f1.4 25mm (50mm equiv) was on display for the first time. We both know I want a fast 'normal' prime lens, it has better image qualities than my Pro zoom at 25mm, and I can afford it. What he didn't understand was how and why I was able to decide by giving more weight to my needs than my wants.