: My Oakley. Juliet's are still going strong , ten years in, bought
: the the metal case to protect them at the time. Didn't realise
: people collect them

There are probably people out there who collect pretty much anything under the sun.

But all the Oakley X-metals are collected now, and Juliets probably the most popular. They have their own jargon, just like watch collectors, with talk of loose nose bridges and couplers!

They have value too - BNIB (brand new in box, effectively NOS) go for between £300 and £400 in the UK (a bit less in the US thanks to greater supply, effectively the reverse of the Heuer situation), and even old knackered ones that need a tune-up (read: servicing) are coming in well over £100 nowadays. Rarer ones, like 24Ks or some of the Ichiros, occasionally nudge into 4 figures!

I "only" have 8 pairs of Juliets amongst my Oakleys, but there are people much deeper in than I am. I think this picture speaks for itself:

They make watches too, but I haven't had the heart to tell those collectors that the watches really aren't all that... several thousand for a quartz watch from what is effectively a fashion brand? I think I'll pass.