I don’t think value to society weighs into the equation, just the ratio of salary to ownership wealth gain.

There are bad people in the working class that are a net detriment to society, just as there are good people in the owning class that are a net benefit. Those good and bad deeds don’t change how they accrue wealth and therefore don’t change their class.

This working class isn’t a morality judgement, it’s a wealth ratio per individual.