For me it was “buy high quality pillow” because you sleep for one thrid of a day etc. I needed a new pillow anyway so I came to the store and bought the best they had. And it was … ok. Like it’s a fine pillow but my sleeping haven’t improved really, it’s basically the same. So I was disapointed :(
So, which life pro tip disappointed you?
I used to stick to that rule and get a sensible mid sized Toyota Corolla or Honda Accord that’s a few years old as needed. But in 2013 (the last time I needed to get a new car) the cost savings were really low compared to new. I think the used market was particularly hot so you’d save less that 10% of the cost, so I ended up getting my 1st and only (so far) brand new car ever.