I wonder if the S5 ceramic has suddenly become collectable in wider context, given there are five of us on here openly buying / seeking one right now (and therefore probably others who haven't mentioned it).
I was looking fairly actively on eBay for a couple of months after it was discontinued, but Euro ones that work with NZ LTE bands were always very expensive and I lost enthusiasm. I did consider buying a US one as I am almost certainly not going to activate the LTE connection, and they seemed to be a lot more realistically priced, but even they were a bit high given the resale if I wanted to move it on would be a lot lower if the LTE wouldn't work or it needed to be shipped back to North America. My thinking was that after some time demand might fall off and prices soften, but perhaps that isn't the case. I was also aware that probably fewer would come up for sale after the rush of upgraders sold their S5 ceramic when they got their S6 replacement.
If the S7 has a ceramic option that will hit S5 ceramic values quite hard I expect, but if it doesn't, and if the S7 doesn't have a killer upgrade feature (and I'm not sure what that could be, beyond massive battery life or case size (thinness) improvements), then perhaps they will maintain or even rise.
Someone suggested that it might be S8 before we see ceramic back again (if then), and I tend to think that is more likely than a ceramic S7. The S7 won't need a fancy case material to tempt people as the case itself will be a new design that should be enough for anyone who is looking for a different case. The S8 might need a bump if it is an "S year" after the S7, so that would be the time to bring ceramic back if it's coming.
