I've been wondering why there's a lot of people that are selling their mining rigs? Mining is dead?
A lot of people bought in back when ETH mining was much more profitable and are now having buyers regret, so theyre selling their rigs (or electrical costs made it not so profitable anymore). Mining isnt dead but right back to about where it was before the big mining craze.
I would disagree with you on that one. For me why im selling hardware is to make room for new hardware, or need to liquidate to pay for new orders. An "upgrade" for some.
Can be alot of reasons. But i get your point, some inexperienced miners finally realized they are not able to buy a lambo from mining with a few rigs.

Theres not much reason for an upgrade as it stands right now though. RX 400/500 series cards are still largely profitable, same goes for the 1060/1070s. Unless youre truly running some older 300 series cards or 200s or just trying to snatch some X11/Scrypt ASICs, there really isnt a reason to do so.