Apparently these go for hundreds now on eBay unopened. IDK why anyone would care about getting this now and needing it to be new when used is $100 with games usually. Dreamcast was a far superior system and commands less of a price unopened.
Guessing we both saw the same article but as soon as I saw it, I knew it was just a dumbass writer... yes, there are consoles being listed for $800, but doesn't mean they sell for that much. Most eBay listing sell around $600 new, which is still a lot but not surprising. Some PS3 models sell for as much as that brand new, even though there were many more PS3s around.
But as already mentioned, it's collectors buying them for that much. Nobody is buying it new to open/play later (which would be dump, unused systems these days are gonna have caked up thermal paste and the controller batteries will likely be dead). I really don't system collecting... games are one thing, games have a much longer shelf life (outside of older cart games with batteries).