I have a $200 Skagen, which didn't last a lifetime - it's only 12-years old, but I recently had to replace the cover glass because it broke (which cost me all of $25, +$5 for a battery change which could likely wait another couple of years, but ... it was already at the watchmaker's, so ...). It is incredibly light (lighter than most e.g. Swatches) but still looks timeless, ageless and (IMO) elegant.
Next time it breaks, which I expect to takes less than 10 years, I'll likely get a new $200 watch.
I don't particularly like to throw away working things, but I also feel that 6 times $200 watches throughout my lifetime makes a lot more sense than one lifetime $1,200 watch.
That said, the spending optimum is likely one $5-$10 watch every couple of years, perhaps even if you had to pay for externalities -- I understand that everyone has their own "sweet spot" for longevity, and your is obviously different than mine (and we are both far away from the spending optimum).