[editted out hard drive swap, OS install, complete machine swap, activation/key issues, etc]
Here's why I love MacOS:
Push power button. Work.
I bought my 2 daughters USED MacBooks 3.5 years ago (after needing to re-image their dell laptops about every 18-months), I haven't touched them since. Bought my mother-in-law a used MacBook 3 years ago.... This is a woman that would jack up a Windows laptop doing nothing but playing web games, searching for recipes and using "the Facebook." Haven't touched it since.
I'm pretty sure I'm not the only whose had that experience.
Now I was a die-hard Windows nerd previously (loved tinkering and building my own machines), but I got sick of being Windows tech support when our inventory of family pcs (that I was responsible for) grew to 5 or 6 machines.
Can someone build MORE raw performance/dollar with Windows? Absolutely, no question. However, I've learned my time and aggravation is worth more.