S19 is roughly 3x the cost of an S9, uses roughly 150% more power, but has around 7.5x the TH.

It would perform even better in this model than the S9.

I just went with an S9 as it is a cheap and approachable miner, is often used for underclocked "pleb-heater" builds, and seemed like the base case for arguing against novelty miners like the Bitaxe.

I cannot argue with the fact that novelty miners represent an easy entrance for newbies, and offer a simpler and less infrastructure-intensive introduction to mining. All I argue is that they are hardly the most economical method for gaining this educational experience, despite often being marketed as such.