That's just one coin, and not cryptonight algorithm. If you know your hashrate you can see daily earnings here: https://www.cryptunit.com/?order=price A single ryzen 1600 will get 4-500 hashes a second on cryptonight v7, and 1500 on cn-lite for example.
Hmmm struggling to see the deal here. A quick amazon search would put components at £510 (without Windows 10 license) and they are all low end parts (especially the PSU). Considering the 1050ti didn't get impacted by the recent graphics card price boom then I'd not consider this I'm afraid. Thanks for the post though OP as not trying to be disparaging.
A Ryzen with slow RAM for 1080p gaming. Raspberry noises :p
They all look pretty dire to me!
Cryptocurrency profit has just started rising again actually. Due to anti-asic resistance implemented by monero and its alts (cryptonight).