Those prices are derived from a site called NiceHash that tries to commodify hashpower. Most people who want to monetize their mining hardware, just... use it to mine, not lease it to a reseller. So both the supply and demand are low. It's a weird market imo.

The last column is important to understand. It's answering the question: if you rented NiceHash's entire supply of compute power, how close would that get you to launching an attack? For any crypto worth caring about, the number is 0% or close to it. And for the others where it's >= 100%, attacks are a common issue for exactly this reason.