@canedane,
I was writing about PCB-s.
Incidentally you have given a reference to a very good price offer.
Scrapyard mentioned by you pays $ 265 per 10kg of mobile PCB what is much above the price which @anachronism considers surprisingly high.
Perhaps now he knows where to sell his stock for a good profit.
They pay for 10kg as much as for ~6.5g Au+Pd.
This suggests that there should be even more of Au+Pd there, or their adventure does *not* make sense, unless there are government subsidies.
It is easy to explain price difference of handsets. In old phones PCB is about 30% of weight of battery and back cover free handset and in smartphones it is usually below 20%.
Regarding gold content in old PCB-s, I have red opinions that in the past manufacturers were more generous with gold platings etc.
Older models were built to last long and new smartphones are just a clever scam directed at milking money out of Millenials who swallow every advertising b/s like pelikans.
So there is no point in making robust smartphone, if social pressure is causing peoples to *upgrade* every year or two because some mysterious and rarely used new functions are there.
Hence more shabby manufacturing practice is OK. Hardly anyone will complain.