I remember reading the Dangerous Minds post when it appeared on HN and thinking "How is this not price gouging at best, or extortion at worst?". I didn't ask a

I remember reading the Dangerous Minds post when it appeared on HN and thinking "How is this not price gouging at best, or extortion at worst?". I didn't ask at the time as I prefer not to get embroiled in possible flame topics, but seriously... how isn't this very shady and likely to result in a class-action? I ask only to understand, my knowledge of US law isn't extensive (UK citizen here).