Any calculations you do with chia, you should count in the fact that CHIA mining destroys hard drives quickly. The fact that they are trying to market it as an eco friendly solution is just misleading. Also there should be warning labels all over the site saying this:
Techspot:
Chia farming can reportedly ruin a 512GB SSD in 40 daysThat article is to spread FUDs.
You will see how inaccurate that article is in next two or three months. $XCH will have bigger mining communities and SSD won't be destroyed after 40 days or longer a little. Time will prove that article is written to spread fuds and collect SSDs at cheaper cost.